A bendable sodium-ion battery

Abstract

The utility model discloses a kind of bendable sodium-ion batteries, including battery body and electrode being set on the upper end of battery body.The utility model, through the double optimization of adjustable lead design and locking structure, while realizing the free bending of lead in multiple angles, ensure that its bending direction and installation space are adapted, avoid excessive bending or distortion caused by direction fixed, significantly reduce the risk of lead breakage and resistance increase;Through the synergistic effect of elastic pre-tightening and anti-loose lines, effectively suppress the connection loosening under vibration or bending condition, through the thickness adaptation of insulating layer and bendable lead, ensure that the flexibility during bending is not interfered by insulating layer, maintain stable conductive performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a bendable sodium-ion battery. Background Technology

[0002] Sodium-ion batteries are rechargeable batteries that primarily function by moving sodium ions between the positive and negative electrodes. Similar to lithium-ion batteries, sodium-ion batteries operate on a similar principle, utilizing the insertion and extraction of sodium ions between the positive and negative electrodes to achieve charging and discharging. During charging, Na+ ions are extracted from the positive electrode, pass through the electrolyte, and insert into the negative electrode. Simultaneously, compensating electrons are supplied to the negative electrode via an external circuit to maintain charge balance between the positive and negative electrodes. During discharging, the process is reversed: Na+ ions are extracted from the negative electrode, pass through the electrolyte, and insert into the positive electrode. Under normal charging and discharging conditions, the insertion and extraction of sodium ions between the positive and negative electrodes does not damage the basic chemical structure of the electrode materials. In the future, sodium-ion batteries will gradually replace lead-acid batteries and be widely used in various low-speed electric vehicles, complementing lithium-ion batteries. The existing sodium-ion batteries have the following drawbacks: First, the leads are fixed, making them unchangeable for installation purposes. When the leads are damaged, the entire device needs to be replaced, increasing maintenance costs. Second, the leads of existing sodium-ion batteries cannot be bent or adjusted for installation, limiting the device's usability and making it inconvenient to use.

[0003] To address this, a publicly disclosed technology proposes a bendable sodium-ion battery, comprising a protective cover, terminals, and a battery body. A protective shell is mounted on the outer side of the battery body, and the surface of the protective shell is provided with reinforcing members. A nameplate groove is provided on the front of the protective shell. A limiting end is welded to the top of the battery body, and two sets of mounting ends are mounted on the top of the limiting end via a current-passing mesh. A terminal is mounted on the top of the mounting end via a threaded structure. A protective cover is mounted on the outer side of the limiting end via a threaded hole that engages with a bolt. A base is mounted on the bottom of the battery body via bolts. This publicly disclosed technology, by installing a threaded component inside the mounting end, facilitates the replacement of the terminal through the internal thread structure, allowing the terminal to be replaced according to installation needs. This improves the flexibility of the device, and when the terminal is damaged, it is easy to disassemble and replace parts without replacing the entire device, thus reducing maintenance costs.

[0004] In the aforementioned disclosed technology, although the terminals of the sodium-ion battery are replaceable through threaded connections, the following defects exist: the initial installation direction of the bent lead end cannot be adjusted due to its rigid connection with the terminal, causing the lead to be forced to bend or twist excessively in a confined space, leading to breakage or increased resistance; the locking structure relies solely on friction fixation of the threaded parts, which is prone to orientation shift or thread loosening under vibration or bending conditions, resulting in mechanical stress concentration and increased contact resistance of the lead; the bent lead end does not have a segmented insulation design, and the exposed area poses a short-circuit risk. In summary, it is necessary to further optimize and improve its structure. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a bendable sodium-ion battery.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bendable sodium-ion battery, comprising a battery body and an electrode disposed on the upper end of the battery body, wherein a connecting post is disposed at the end of the electrode away from the battery body, a connecting seat is slidably connected to the upper end of the connecting post, a locking ring is rotatably connected to the lower end of the connecting seat, the end of the locking ring away from the connecting seat is threadedly connected to the outer wall of the electrode, a conductive seat is disposed between the upper end of the connecting post and the inner upper wall of the connecting seat, a bendable lead is fixedly connected to the upper wall of the conductive seat, the end of the bendable lead away from the conductive seat passes through the upper wall of the connecting seat and extends to the upper side of the connecting seat, an insulating layer is disposed on the outer wall of the bendable lead and in the area between the conductive seat and the connecting hole, the thickness of the bendable lead is 8-12μm, and the thickness of the insulating layer is 15-25μm.

[0007] As a further description of the above technical solution:

[0008] The bendable lead is a nickel-plated copper foil.

[0009] As a further description of the above technical solution:

[0010] The insulating layer is polyimide.

[0011] As a further description of the above technical solution:

[0012] An elastic layer, made of fluororubber, is provided between the upper end of the electrode and the lower end of the connector, and between the inner wall of the locking ring and the outer wall of the connecting column.

[0013] As a further description of the above technical solution:

[0014] The top view of the connecting column is a regular polygon, and the inner wall of the connecting seat is adapted to the shape of the connecting column.

[0015] As a further description of the above technical solution:

[0016] The outer wall of the locking ring is provided with a knurled layer to increase contact friction.

[0017] As a further description of the above technical solution:

[0018] The flexible lead has a connection hole at the end away from the conductive base.

[0019] This utility model has the following beneficial effects:

[0020] 1. Compared with existing technologies, this bendable sodium-ion battery, through the dual optimization of adjustable lead wire design and locking structure, enables the lead wire to bend freely at multiple angles while ensuring that its bending direction matches the installation space, avoiding excessive bending or twisting caused by fixed direction, and significantly reducing the risk of lead wire breakage and increased resistance; through the synergistic effect of elastic pre-tightening and anti-loosening texture, it effectively suppresses connection loosening under vibration or bending conditions, reduces mechanical stress concentration, and extends the service life of the lead wire.

[0021] 2. Compared with the prior art, this bendable sodium-ion battery has an insulating layer in the key conductive contact area of ​​the bendable lead, which avoids the risk of short circuit caused by the contact between the exposed metal area and adjacent components. At the same time, by matching the thickness of the insulating layer with that of the bendable lead, the flexibility during bending is not interfered with by the insulating layer, thus maintaining stable conductivity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a bendable sodium-ion battery proposed in this utility model.

[0023] Figure 2 This invention proposes a bendable sodium-ion battery. Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a partial cross-sectional view of the electrodes, connecting posts, connecting seats, and bendable lead connection structure of a bendable sodium-ion battery proposed in this utility model.

[0025] Figure 4 This is a top-view schematic diagram of the bendable lead wire and conductive base electrical connection structure of a bendable sodium-ion battery proposed in this utility model.

[0026] Figure 5 This is a schematic diagram of the electrode, connecting post, and elastic layered structure of a bendable sodium-ion battery proposed in this utility model.

[0027] Legend:

[0028] 1. Electrode; 2. Connector; 3. Locking ring; 4. Knurled layer; 5. Bendable lead wire; 6. Insulating layer; 7. Connecting hole; 8. Elastic layer; 9. Connecting post; 10. Conductive base. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1 to 5 The present invention provides a bendable sodium-ion battery, comprising a battery body and an electrode 1 disposed on the upper end of the battery body;

[0031] To achieve reliable sealing and stress buffering at the electrode 1 interface, a connecting post 9 is provided at the end of electrode 1 away from the battery body. A connecting seat 2 is slidably connected to the upper end of the connecting post 9, and a locking ring 3 is rotatably connected to the lower end of the connecting seat 2. The end of the locking ring 3 away from the connecting seat 2 is threaded to the outer wall of electrode 1. A conductive seat 10 is provided between the upper end of the connecting post 9 and the inner upper wall of the connecting seat 2. An elastic layer 8 is provided between the upper end of electrode 1 and the lower end of the connecting seat 2, and between the inner wall of the locking ring 3 and the outer wall of the connecting post 9. The elastic layer 8 is fluororubber.

[0032] During the spinning process of the locking ring 3, the elastic layer 8 undergoes radial compression deformation, forming a continuous sealing barrier on the joint surface between the connecting column 9 and the electrode 1. At the same time, it absorbs the axial stress under bending conditions. The extrusion force of the elastic layer 8 makes the locking ring 3 less prone to loosening.

[0033] To facilitate adjustment of the initial installation orientation of the bendable lead wire 5, the top view projection of the connecting post 9 is a regular polygon, and the inner wall of the connecting seat 2 is adapted to the shape of the connecting post 9.

[0034] With the above structure, during initial installation, the connection direction between the connector 2 and the connector 9 can be adjusted according to actual needs, thereby fixing the initial installation position of the bendable lead 5 and preventing twisting when the bendable lead 5 is excessively bent in the future.

[0035] To improve the ease of operation and locking reliability of the locking ring 3, a knurled layer 4 is provided on the outer wall of the locking ring 3 to increase contact friction.

[0036] When the locking ring 3 is tightened, the knurled layer 4 increases the friction between the operator's hand and the ring body, preventing slippage and achieving precise torque control, ensuring that the threaded connection reaches the preset preload.

[0037] In order to provide a low-resistance conductive path that can adapt to bending deformation, a bendable lead 5 is fixedly connected to the upper wall of the conductive base 10. The end of the bendable lead 5 away from the conductive base 10 passes through the upper wall of the connecting base 2 and extends to the upper side of the connecting base 2. The bendable lead 5 is a copper foil with nickel plating on the surface. A connection hole 7 is provided at the end of the bendable lead 5 away from the conductive base 10.

[0038] When the nickel-plated copper foil substrate is bent, stress is released through lattice slip. The connection hole 7 provides a standardized wiring interface to realize flexible interconnection between the battery body and external circuits.

[0039] To prevent short circuits caused by insulation failure during high-frequency bending of the flexible lead 5, an insulating layer 6 is provided on the outer wall of the flexible lead 5 in the area between the conductive base 10 and the connecting hole 7. The insulating layer 6 is polyimide.

[0040] When the lead wire is repeatedly bent, the polyimide insulating layer 6 maintains dielectric integrity through the flexible extension of molecular chains, preventing the copper foil from contacting the external conductor and avoiding the risk of leakage.

[0041] To balance conductivity and bending life, the thickness of the bendable lead 5 is 8-12μm;

[0042] Copper foil with a thickness range of 8-12μm combines low resistivity with high cyclic bending resistance;

[0043] In order to achieve effective insulation without affecting flexibility, the thickness of insulation layer 6 is 15-25μm;

[0044] When the insulating layer 6 and the flexible lead 5 are composited in a ratio of 15-25μm / 8-12μm, the polyimide molecular chain and the copper foil lattice deform in synergy, meeting the insulation requirements of sodium-ion batteries, while ensuring that the bending radius of the composite is ≤1.5mm.

[0045] Working principle: During the spinning process of the locking ring 3, the elastic layer 8 undergoes radial compression deformation, forming a continuous sealing barrier on the mating surface of the connecting post 9 and the electrode 1. Simultaneously, it absorbs axial stress under bending conditions. The compressive force of the elastic layer 8 prevents the locking ring 3 from loosening. During initial installation, the connection direction between the connecting seat 2 and the connecting post 9 can be adjusted according to actual needs, thereby fixing the initial installation position of the bendable lead 5 and preventing twisting during excessive bending of the bendable lead 5. When tightening the locking ring 3, the knurled layer 4 increases the friction between the operator's hand and the ring body, preventing slippage and achieving precise torque control, ensuring that the threaded connection reaches the preset preload. When the nickel-copper foil substrate is bent, stress is released through lattice slippage. The connection hole 7 provides a standardized wiring interface, realizing flexible interconnection between the battery body and external circuits. When the lead wire is repeatedly bent, the polyimide insulating layer 6 maintains dielectric integrity through flexible extension of molecular chains, preventing the copper foil from contacting external conductors and avoiding leakage risks. The copper foil has both low resistivity and high cycle bending tolerance in the thickness range of 8-12μm. When the insulating layer 6 and the bendable lead wire 5 are combined in a ratio of 15-25μm / 8-12μm, the polyimide molecular chains and the copper foil lattice deform in synergy, meeting the insulation requirements of sodium-ion batteries, while ensuring that the bending radius of the composite is ≤1.5mm.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bendable sodium-ion battery, characterized in that: The battery includes a battery body and an electrode (1) disposed on the upper end of the battery body. A connecting post (9) is disposed at the end of the electrode (1) away from the battery body. A connecting seat (2) is slidably connected to the upper end of the connecting post (9). A locking ring (3) is rotatably connected to the lower end of the connecting seat (2). The end of the locking ring (3) away from the connecting seat (2) is threadedly connected to the outer wall of the electrode (1). A conductive seat is disposed between the upper end of the connecting post (9) and the inner upper wall of the connecting seat (2). 10) A bendable lead wire (5) is fixedly connected to the upper wall of the conductive base (10). The end of the bendable lead wire (5) away from the conductive base (10) passes through the upper wall of the connecting base (2) and extends to the upper side of the connecting base (2). An insulating layer (6) is provided on the outer wall of the bendable lead wire (5) in the area between the conductive base (10) and the connecting hole (7). The thickness of the bendable lead wire (5) is 8-12μm, and the thickness of the insulating layer (6) is 15-25μm.

2. The bendable sodium-ion battery according to claim 1, characterized in that: The bendable lead (5) is a nickel-plated copper foil.

3. A bendable sodium-ion battery according to claim 1, characterized in that: The insulating layer (6) is polyimide.

4. A bendable sodium-ion battery according to claim 1, characterized in that: An elastic layer (8) is provided between the upper end of the electrode (1) and the lower end of the connecting seat (2), and between the inner wall of the locking ring (3) and the outer wall of the connecting column (9). The elastic layer (8) is fluororubber.

5. A bendable sodium-ion battery according to claim 1, characterized in that: The top view of the connecting column (9) is a regular polygon, and the inner wall of the connecting seat (2) is adapted to the shape of the connecting column (9).

6. A bendable sodium-ion battery according to claim 1, characterized in that: The outer wall of the locking ring (3) is provided with a knurled layer (4) to increase the contact friction.

7. A bendable sodium-ion battery according to claim 1, characterized in that: The flexible lead (5) has a connection hole (7) at the end away from the conductive base (10).

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