Composite battery contact device

Abstract

The utility model relates to battery electrode connection technical field provides a composite battery contact device, including folding type metal spring and spring, spring is located folding type metal spring inside, and the axial direction of spring is identical with the elongation direction of folding type metal spring, is used for lifting folding type metal spring, folding type metal spring is by base, top piece and foldable spring piece and is composed, foldable spring piece both ends are fixedly connected with base, top piece respectively, and one end of spring is fixedly connected with base, and the side of top piece close to base is provided with the ring groove of contour adaptation with spring top portion. The device is through the composite structure of spring and folding type metal spring, has integrated the advantage of spring long stroke and metal spring low internal resistance, has promoted the stability and reliability of battery contact.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode connection technology, and more specifically, to a composite battery contact device. Background Technology

[0002] In the field of battery applications, battery contacts are key components that connect the battery to external circuits, and their performance directly affects the operational stability and safety of the equipment.

[0003] Currently, the mainstream battery contact pieces on the market are mainly divided into two types: spring connection and metal spring connection. While spring-connected contact pieces have the advantage of long travel, absorbing larger movement errors and adapting to positional shifts during battery assembly, they suffer from high contact resistance and high internal resistance, making it difficult to meet the demands of high current transmission. In high-power applications, they are prone to overheating and voltage loss. On the other hand, metal spring-connected contact pieces, although with low contact resistance and low internal resistance, are suitable for high current flow. However, due to their short travel and low yield strength, they cannot provide sufficient contact pressure when dealing with large, heavy batteries, easily leading to poor contact. Furthermore, they are difficult to adapt to larger errors during battery installation, greatly limiting their application in the large battery field.

[0004] Therefore, a new battery contact structure needs to be developed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve the defects of existing spring-connected battery contact pieces, such as high contact resistance and inability to handle large currents, as well as the defects of metal spring-connected battery contact pieces, such as short stroke, low yield strength, and unsuitability for large batteries. A composite battery contact device is proposed.

[0006] The embodiments of this utility model are achieved through the following technical solutions: A composite battery contact device includes: a foldable metal spring and a spring, wherein the spring is located inside the foldable metal spring and the axial direction of the spring is consistent with the elongation direction of the foldable metal spring, for supporting the foldable metal spring.

[0007] Preferably, the foldable metal spring includes a base, a top plate, and a foldable spring; one end of the foldable spring is fixedly connected to the base, and the other end of the foldable spring is fixedly connected to the top plate; one end of the spring is fixedly connected to the base, and the other end is fitted to the top plate; an annular groove is formed on the side of the top plate near the base; the annular groove is adapted to the top contour of the spring. The foldable spring has a corrugated folding structure, and the folded part of the corrugated folding structure has a rounded corner with a radius ≥0.5mm.

[0008] Preferably, the base has a mounting groove, through which the foldable spring can be inserted into the base.

[0009] Preferably, the folding metal spring is made of beryllium bronze.

[0010] Preferably, the surface of the annular groove is covered with an insulating ceramic coating.

[0011] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: 1. By using a composite structure of spring and folded metal spring, and combining the characteristics of long spring stroke and low internal resistance of metal spring, the technical defects of high resistance of traditional spring contact piece and short stroke of metal spring are effectively solved, so as to achieve stable conduction of large current.

[0012] 2. A ring groove that matches the top contour of the spring is provided on the top plate, which can effectively limit the displacement of the spring and ensure that stable contact pressure is maintained even under battery installation errors or vibration environments, thus avoiding poor contact.

[0013] 3. The insulating ceramic coating on the surface of the ring groove isolates the conductive path between the spring and the contact piece, reducing the risk of short circuit; at the same time, it prevents oxidation and current corrosion at the contact points, ensuring long-term stable conductivity and improving electrical safety. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A top view of the composite battery contact device provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 A sectional view along section AA; Figure 3 for Figure 2 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the structure before the foldable spring is inserted into the base and rotated 90°.

[0016] Figure 5 This is a top view of the top piece in Embodiment 1 of this utility model.

[0017] Reference numerals: 10-folding metal spring, 11-base, 12-foldable spring, 13-top piece, 14-ring groove, 20-spring. Detailed Implementation

[0018] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0019] Example 1 like Figures 1 to 5 As shown, this embodiment provides a composite battery contact device, including a foldable metal spring 10 and a spring 20. The foldable metal spring 10 has a corrugated folding structure, and the spring 20 is located inside the foldable metal spring 10, with its axial direction aligned with the extension direction of the foldable metal spring 10, serving to lift the foldable metal spring 10.

[0020] The foldable metal spring 10 includes a base 11, a top plate 13, and a foldable spring 12. The foldable spring 12 is made of beryllium bronze, a material with excellent fatigue resistance and good electrical conductivity. The foldable spring 12 has a corrugated folding structure, with rounded corners at the folds having a radius ≥0.5mm to reduce the stress concentration factor at the folds and prevent cracks or breakage during repeated deformation. The base 11 has a mounting groove. Figure 4 As shown, during assembly, the operator can initially insert the foldable spring clip 12 through the mounting slot and pass it through the base 11; as Figure 3 As shown, the portion of the foldable spring 12 extending from the base is then twisted 90° to secure it firmly onto the base 11. In the actual production process of the battery contact device, the portion of the foldable spring 12 after being twisted 90° is usually inserted into the PCB board, and then the two are firmly connected by soldering to ensure the overall structure is stable and reliable.

[0021] The other end of the foldable spring 12 is fixedly connected to the top plate 13 to form a complete force transmission structure.

[0022] One end of the spring 20 is fixedly welded to the base 11, and the other end is attached to the top plate 13. As the device gradually approaches and contacts the battery electrode, the spring 20 will undergo elastic compression deformation due to the pressure of the battery electrode. The elastic restoring force generated by the spring 20 will be transmitted to the top plate 13, thereby ensuring stable contact between the foldable metal spring 10 and the battery electrode.

[0023] The top plate 13 has an annular groove 14 on the side near the base 11 that matches the top contour of the spring 20. When the spring 20 is compressed, the top of the spring 20 will be embedded in the annular groove 14. On the one hand, this restricts the radial displacement of the spring 20 inside the foldable metal spring 10, ensuring that the force of the spring 20 is always transmitted axially and maintaining a stable contact pressure between the spring 20 and the top plate 13. On the other hand, the close fit between the annular groove 14 and the top of the spring 20 can reduce the relative friction between them, reduce the degree of wear, and extend the service life of the device.

[0024] In addition, the surface of the annular groove 14 is covered with an insulating ceramic coating. During the entire conduction process, the insulating ceramic coating can effectively isolate the conductive contact between the spring 20 and the folded metal spring 10, avoid the risk of short circuit, and prevent the contact point from oxidizing due to the current, thus ensuring stable conductivity.

[0025] Its specific working principle is as follows: When the battery is installed, the battery electrodes apply axial pressure to the top plate 13, which is then transmitted sequentially to the foldable spring 12 and the spring 20. Under pressure, the corrugated folding structure of the foldable spring 12 contracts and deforms, while the spring 20 is compressed. Compared to the limited expansion and contraction of traditional springs, the long stroke of the spring 20 allows the entire device to store elastic potential energy within a larger compression range. That is, even if there are significant differences in the installation depth of different batteries, or if there are certain errors during installation, the spring 20 can adapt through sufficient expansion and contraction, forming a stepped buffer mechanism with the foldable spring 12 to ensure stable contact between the top plate 13 and the battery electrodes. Furthermore, because the foldable spring 12 is made of beryllium bronze and has a reasonable rounded corner at the fold, it maintains good elastic recovery during contraction, while the axial arrangement of the spring 20 ensures uniform pressure transmission and prevents misalignment between the top plate 13 and the battery electrodes. Simultaneously, the top of the spring 20 is embedded in the annular groove 14 of the top plate 13. The radial constraint of the annular groove 14 prevents the spring 20 from shifting laterally due to uneven pressure, ensuring a stable fit with the top plate 13 and maintaining constant contact pressure. At this time, the folded metal spring 10 is in close contact with the battery electrode through the top plate 13, forming an efficient conductive path with the help of the excellent conductivity of beryllium bronze, realizing the transfer of electrical energy between the battery and the external circuit.

[0026] When the battery is subjected to external disturbances such as vibration and impact, or when its position fluctuates due to installation errors, the corrugated structure of the foldable spring 12 and the elastic deformation of the spring 20 work together to provide a buffering effect. The corrugated structure of the foldable spring 12 can absorb some of the vibration energy through its own expansion and contraction, while the spring 20 compensates for position changes by adjusting its compression in real time, ensuring that the contact pressure between the top plate 13 and the battery electrode is always maintained within a reasonable range.

[0027] In addition, the insulating ceramic coating on the surface of the annular groove 14 not only isolates the conductive path between the spring 20 and the folded metal spring 10 to prevent short circuit faults, but also resists oxidation and corrosion of the contact points, ensuring that the contact resistance will not increase significantly with the increase of usage time, thereby ensuring the stable conductive function of the composite battery contact device, which is suitable for scenarios such as power batteries and energy storage devices with high current and high reliability requirements.

[0028] In summary, this utility model effectively integrates the advantages of long spring stroke and low internal resistance of metal spring through the composite structure design of spring 20 and foldable metal spring 10, combined with innovative designs such as annular groove 14 and insulating coating. It not only solves the technical defects of traditional contact pieces, but also improves the safety, reliability and environmental adaptability of the contact device, and is suitable for high current application scenarios such as electric vehicle power batteries and energy storage power stations.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A composite battery contact device, characterized in that, include: A folding metal spring and a spring, wherein the spring is located inside the folding metal spring and the axial direction of the spring is consistent with the extension direction of the folding metal spring, for supporting the folding metal spring.

2. A composite battery contact device according to claim 1, wherein The foldable metal spring includes a base, a top plate, and a foldable spring; one end of the foldable spring is fixedly connected to the base, and the other end of the foldable spring is fixedly connected to the top plate. One end of the spring is fixedly connected to the base, and the other end is attached to the top plate.

3. The composite battery contact device according to claim 2, characterized in that, The foldable spring sheet has a corrugated folding structure, and the folded part of the corrugated folding structure has a rounded corner with a radius of ≥0.5mm.

4. The composite battery contact device of claim 2, wherein, The base has a mounting slot, through which the foldable spring can be inserted into the base.

5. A composite battery contact device according to claim 1, characterized in that, The foldable metal shrapnel is made of beryllium bronze.

6. The composite battery contact device of claim 2, wherein, The top plate has an annular groove on the side near the base; the annular groove is adapted to the top contour of the spring.

7. A composite battery contact device according to claim 6, characterized in that, The surface of the annular groove is covered with an insulating ceramic coating.

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