A connecting piece structure and a battery

Abstract

This utility model discloses a connecting piece structure and a battery, relating to the field of battery technology. It includes a connecting area, a positive electrode welding area, and a negative electrode welding area. One side of the connecting area is connected to the positive electrode welding area, and the other side is connected to the negative electrode welding area. The surface of the positive electrode welding area has a raised structure, and the side of the negative electrode welding area away from the connecting area is an arc-shaped area. In this utility model, the arc-shaped design of the negative electrode welding area and the arc-shaped negative electrode welding line trajectory optimize the current conduction path, making the current distribution between the cells more uniform. This uniform current distribution reduces local overheating caused by current concentration, avoids local overcharging and discharging of the cells, and extends the lifespan of the cells.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a connecting piece structure and a battery. Background Technology

[0002] With the increasing penetration rate of new energy electric vehicles, electric vehicles using cylindrical battery cells are gradually attracting user attention. The fast charging capability of batteries has become a highlight for major automakers. The fast charging capability of batteries can be improved in many ways, such as the chemical system of the battery cell, the core design, the cell structure design, the pack structure design, the heat dissipation design, etc.

[0003] Existing cell terminal connection methods mainly include riveting, welding, injection molding, or a combination of the above two methods. When the cell terminals are riveted or welded, due to manufacturing process limitations, a large portion of the terminal end face area is occupied. When the cells are arranged and installed in the battery pack, the connecting pieces connecting adjacent cells will also be welded to the cell terminals. At this time, the welding area of ​​the connecting pieces will be limited. Utility Model Content

[0004] The purpose of this invention is to provide a connecting piece structure and a battery to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows: A connecting piece structure includes a connecting area, a positive electrode welding area, and a negative electrode welding area. One side of the connecting area is connected to the positive electrode welding area, and the other side of the connecting area is connected to the negative electrode welding area. The surface of the positive electrode welding area is provided with a protruding structure, and the side of the negative electrode welding area away from the connecting area is an arc-shaped area.

[0006] Preferably, a negative electrode welding wire trajectory is provided on the arc-shaped area, and the negative electrode welding wire trajectory is arranged in an arc shape.

[0007] As a further preferred embodiment, the raised structure is provided with solder marks.

[0008] Preferably, the connection area, the positive electrode welding area, and the negative electrode welding area are integrally formed.

[0009] Preferably, the connection area and the positive electrode welding area are in the same plane, and the connection area and the negative electrode welding area are in different planes.

[0010] As a further preferred embodiment, the arc length of the negative electrode bonding wire trajectory is L, the area of ​​the solder mark is S, and the width of the connection area is D. The relationship between the arc length of the negative electrode bonding wire trajectory, the area of ​​the solder mark, and the width of the connection area satisfies: .

[0011] Preferably, the connection area is provided with a weak area.

[0012] As a further preferred embodiment, the raised structure is coaxially arranged with the solder mark.

[0013] Preferably, the protruding structure is integrally formed with the positive electrode welding area.

[0014] A battery includes the aforementioned connecting tab structure and a plurality of battery cells. The connecting tab structure is disposed between two adjacent battery cells. The protruding structure in the connecting tab structure is connected to the terminal post in the positive electrode of the battery cell, and the negative electrode welding area is connected to the negative terminal of the battery cell.

[0015] The above technical solution has the following advantages or beneficial effects: (1) In this utility model, the raised structure of the positive electrode welding area of ​​the connecting piece increases the contact area with the positive electrode post of the battery cell.

[0016] (2) In this utility model, the arc-shaped design of the negative electrode welding area and the arc-shaped negative electrode welding line trajectory optimize the current conduction path, making the current distribution between the cells more uniform. This uniform current distribution reduces the local overheating phenomenon caused by current concentration, avoids local overcharging and discharging of the cells, and extends the service life of the cells.

[0017] (3) In this utility model, the unique structural design of the connecting piece makes it easier to position and install during battery assembly. Operators can quickly align the protruding structure of the connecting piece with the positive terminal of the battery cell and the negative welding area with the negative terminal of the battery cell, reducing the adjustment time during the installation process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connecting piece structure in this utility model; Figure 2 This is a perspective view of the connecting piece structure in this utility model; Figure 3 This is a schematic diagram of the connection piece structure and its cooperation with the battery cell in this utility model.

[0019] In the diagram: 1. Connection area; 2. Positive electrode welding area; 3. Negative electrode welding area; 4. Negative electrode welding line trajectory; 5. Raised structure; 6. Weld mark; 7. Arc-shaped area; 8. Battery cell. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Figure 1 This is a schematic diagram of the connecting piece structure in this utility model; Figure 2 This is a perspective view of the connecting piece structure in this utility model; Figure 3 This is a schematic diagram of the connection piece structure and its interaction with the battery cell in this utility model. Please refer to [link / reference]. Figures 1 to 3 As shown, a connecting plate structure includes a connecting area 1, a positive electrode welding area 2, and a negative electrode welding area 3. One side of the connecting area 1 is connected to the positive electrode welding area 2, and the other side of the connecting area 1 is connected to the negative electrode welding area 3. The surface of the positive electrode welding area 2 is provided with a raised structure 5, and the side of the negative electrode welding area 3 away from the connecting area 1 is an arc-shaped area 7. In this embodiment, the connecting area 1 serves as an intermediate connecting transition area, with one side connected to the positive electrode welding area 2 and the other side connected to the negative electrode welding area 3. This arrangement establishes a stable current conduction path between the positive and negative electrodes of the battery cell 8. When the battery is working, current flows out from the positive electrode of the battery cell 8, is conducted through the positive electrode welding area 2 and the connecting area 1 to the negative electrode welding area 3, and then flows into the negative electrode of the adjacent battery cell 8, realizing the current circulation inside the battery. The connecting area 1 plays a transitional role, ensuring that the positive electrode welding area 2 and the negative electrode welding area 3 can work together to effectively connect the internal circuit of the battery.

[0024] This configuration optimizes the internal connection structure of the battery. Compared to traditional methods such as riveting, welding, injection molding, or combinations thereof, the connection piece structure in this embodiment is more compact, which helps to shorten the current transmission path, reduce resistance loss, and improve current conduction efficiency, thereby enhancing the battery's fast-charging performance. Simultaneously, this connection layout also enhances the battery's stability during charging and discharging, reducing performance fluctuations caused by unstable connections.

[0025] In this embodiment, a raised structure 5 is provided on the surface of the positive electrode welding area 2, as detailed in the following document. Figure 2 As shown, the protruding structure 5 can significantly increase the contact area with the positive terminal of the battery cell 8 when connected. During the welding process, the larger contact area can provide more welding points, making the connection more secure.

[0026] Furthermore, as a preferred embodiment, a negative electrode welding wire trajectory 4 is provided on the arc-shaped region 7, and the negative electrode welding wire trajectory 4 is arranged in an arc shape. During welding, the solder will be distributed along this trajectory, ensuring the uniformity and stability of the welding. Since this trajectory matches the shape of the arc-shaped region 7, the welding points can be evenly distributed on the contact surface between the arc-shaped region 7 and the negative electrode of the battery cell 8, thereby improving the reliability of the connection. In addition, the end of the negative electrode welding region 3 is an arc-shaped region 7, which can significantly increase the length of the welding wire.

[0027] Furthermore, as a preferred embodiment, the raised structure 5 is provided with solder marks 6. In this embodiment, the solder marks 6 on the raised structure 5 provide specific location markers for welding and enhance the welding effect. During welding, the solder concentrates in the area of ​​the solder marks 6, making the welding more precise and robust. The solder marks 6 increase the bonding force between the welding material and the raised structure 5, further improving the reliability of the connection between the connecting piece and the positive terminal of the battery cell 8.

[0028] Furthermore, as a preferred implementation, the connecting area 1, the positive electrode welding area 2, and the negative electrode welding area 3 are integrally formed. This method ensures the integrity and continuity between the various parts of the connecting piece, eliminating gaps or weak points caused by splicing or assembly. During battery charging and discharging, especially during fast charging, the integrally formed connecting piece can better withstand current surges and mechanical stresses. When the battery is subjected to external forces such as vibration, impact, or high current surges during fast charging, the integrally formed connecting piece can better maintain structural integrity, ensuring the stability of the internal connections of the battery.

[0029] Furthermore, as a preferred implementation, the connection area 1 and the positive electrode welding area 2 are in the same plane, while the connection area 1 and the negative electrode welding area 3 are in different planes. This design is based on the structural characteristics of the cylindrical cell 8, the spatial layout within the battery pack, and the connection requirements of the cell 8. The connection area 1 and the positive electrode welding area 2, being in the same plane, facilitate parallel connection with the positive electrode of the cell 8, ensuring connection stability and smooth current conduction. The different planes of the connection area 1 and the negative electrode welding area 3 allow the connecting piece to better adapt to the spatial differences between the positive and negative electrodes of the cylindrical cell 8. Especially when the cells 8 are closely arranged, this arrangement can effectively avoid connection interference problems.

[0030] Furthermore, as a preferred embodiment, the arc length of the negative electrode bonding wire trajectory 4 is L, the area of ​​the solder mark 6 is S, and the width of the connection area 1 is D. The relationship between the arc length of the negative electrode bonding wire trajectory 4, the area of ​​the solder mark 6, and the width of the connection area 1 satisfies: This relationship ensures the functional synergy and balance of the various parts of the connector. The appropriate solder area S of the solder mark 6 can guarantee the strength and stability of the weld, enabling it to withstand the impact of large currents during fast charging. The width D of the connection area 1, which is equal to the area of ​​the solder mark 6, can ensure that the connection area 1 has sufficient current carrying capacity when conducting current, meeting the high current requirements during fast charging. The arc length L of the negative electrode welding line trajectory 4, which is equal to the previous two, helps to achieve uniform current conduction in different areas of the connector and avoid current concentration.

[0031] Furthermore, as a preferred embodiment, a weak area is provided on the connection area 1. The weak area can be achieved by thinning at a specific location in the connection area 1 or by employing a specific material structure design. When the battery needs to be disassembled or adjusted during production, repair, or upgrades, the weak area can serve as a point prone to breakage or deformation. By applying a certain external force, the connection piece can be broken or deformed at the weak area, thereby achieving adjustment of the connection piece without causing excessive damage to other parts of the connection piece. In this embodiment, the weak area can be located near the positive electrode welding area 2 or the negative electrode welding area 3, or it can be located in the middle of the connection area 1. The provision of the weak area facilitates the later maintenance and adjustment of the connection piece.

[0032] Furthermore, as a preferred embodiment, the raised structure 5 and the solder mark 6 are coaxially arranged, which ensures that the solder can be evenly distributed on the contact surface between the raised structure 5 and the positive electrode post of the cell 8 during the welding process. Since the solder mark 6 and the raised structure 5 are coaxial, the heat and solder can be evenly diffused around the axis of symmetry during welding, making the welding point more evenly distributed on the raised structure 5, thereby improving the strength and stability of the connection.

[0033] Furthermore, as a preferred embodiment, the protruding structure 5 is integrally formed with the positive electrode welding area 2. When manufacturing the positive electrode welding area 2, the protruding structure 5 is directly formed on the surface of the positive electrode welding area 2 through molds and processing technology, which ensures the connection strength and integrity between the protruding structure 5 and the positive electrode welding area 2, and there are no gaps or weak points caused by later assembly or connection.

[0034] A battery includes a connecting plate structure and several battery cells 8. Connecting plate structures are respectively disposed between adjacent battery cells 8. A protruding structure 5 in the connecting plate structure is connected to the positive terminal of the battery cell 8, and a negative electrode welding area 3 is connected to the negative terminal of the battery cell 8. In use, the connection between adjacent battery cells 8 is achieved by directly connecting the protruding structure 5 in the connecting plate structure to the positive terminal of the battery cell 8 and the negative electrode welding area 3 to the negative terminal of the battery cell 8. This enables electrical connection between the battery cells 8 inside the battery, allowing current to be conducted orderly between the cells, realizing the battery's charging and discharging functions, especially meeting the high current conduction requirements during fast charging. During fast charging, the special structure of the connecting plate ensures that the current can be transferred efficiently and stably between the battery cells 8, reducing resistance loss and localized overheating.

[0035] In this embodiment, the connection plate structure improves the stability and consistency of the overall battery performance, reducing battery failures caused by connection problems. During battery assembly, the connection plate design facilitates quick and precise installation, improving production efficiency and reducing labor costs. Simultaneously, the stable connection method helps optimize the current distribution within the battery, enabling each cell 8 to charge and discharge evenly. Especially during fast charging, this reduces localized overcharging and discharging of cells 8, extending battery life.

[0036] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connecting piece structure, characterized in that, It includes a connection area, a positive electrode welding area, and a negative electrode welding area. One side of the connection area is connected to the positive electrode welding area, and the other side of the connection area is connected to the negative electrode welding area. The surface of the positive electrode welding area is provided with a raised structure, and the side of the negative electrode welding area away from the connection area is an arc-shaped area.

2. The connecting piece structure as described in claim 1, characterized in that, The arc-shaped area is provided with a negative electrode welding wire trajectory, which is arranged in an arc shape.

3. The connecting piece structure as described in claim 2, characterized in that, The protruding structure has solder marks.

4. The connecting piece structure as described in claim 1, characterized in that, The connection area, the positive electrode welding area, and the negative electrode welding area are integrally formed.

5. The connecting piece structure as described in claim 1, characterized in that, The connection area and the positive electrode welding area are in the same plane, while the connection area and the negative electrode welding area are in different planes.

6. The connecting piece structure as described in claim 3, characterized in that, The arc length of the negative electrode bonding wire trajectory is L, the area of ​​the solder mark is S, and the width of the connection area is D. The relationship between the arc length of the negative electrode bonding wire trajectory, the area of ​​the solder mark, and the width of the connection area satisfies: 2 =H1=L.

7. The connecting piece structure as described in claim 1, characterized in that, The connection area is provided with a weak area.

8. The connecting piece structure as described in claim 3, characterized in that, The raised structure is coaxially arranged with the solder mark.

9. The connecting piece structure as described in claim 1, characterized in that, The protruding structure is integrally formed with the positive electrode welding area.

10. A battery comprising the connecting piece structure according to any one of claims 1-9, characterized in that, It also includes several battery cells, with the connecting plate structure respectively provided between two adjacent battery cells. The protruding structure in the connecting plate structure is connected to the terminal post in the positive electrode of the battery cell, and the negative electrode welding area is connected to the negative terminal of the battery cell.

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