Droplet-proof liquid injection nozzle and battery liquid injection device

Abstract

The utility model discloses a kind of anti-dripping liquid injection needle nozzle and battery liquid injection device, the anti-dripping liquid injection needle nozzle includes needle nozzle main body, expansion assembly and anti-dripping assembly, the needle nozzle main body has first liquid inlet end;The expansion assembly is sealingly arranged on first liquid inlet end, cavity is formed in its inside, and the side of expansion assembly away from first liquid inlet end forms second liquid inlet end;The anti-dripping assembly is arranged in cavity and two ends are located inside first liquid inlet end and second liquid inlet end respectively, anti-dripping assembly has the first state allowing electrolyte to enter cavity from second liquid inlet end and the second state preventing electrolyte from entering cavity from second liquid inlet end, first state is used for liquid injection, and second state is used for blocking electrolyte.The utility model can solve the technical problem that existing liquid injection needle nozzle is prone to corrosion cell surface with liquid overflow phenomenon, increase the probability of cell appearance defective.

Description

Technical Field

[0001] This utility model relates to the field of battery liquid filling technology, specifically to an anti-drip liquid filling needle and a battery liquid filling device. Background Technology

[0002] During battery production, electrolyte injection is required. Existing technologies often employ electrolyte injection devices, which typically include a reservoir, delivery pipes, and injection needles, as illustrated in Chinese Utility Model Patent No. CN218677520U, which discloses a "Battery Electrolyte Injection Device." However, the injection needles in these prior art lack anti-drip structures. After each injection, some electrolyte overflows from the needle. During subsequent injections, this overflowing electrolyte has a chance to drip onto the battery cell, causing corrosion and resulting in a defective product. Utility Model Content

[0003] In view of this, the present invention provides an anti-drip injection needle and a battery injection device to solve the technical problem that the existing injection needles have leakage phenomena that easily corrode the surface of the battery cell and increase the probability of defective battery cells.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] On the one hand, this utility model provides an anti-drip injection needle nozzle, comprising:

[0006] A needle tip body, wherein the needle tip body has a first liquid inlet end;

[0007] An expansion assembly is sealed to the first liquid inlet end. A cavity is formed inside the expansion assembly, and the cavity is connected to the first liquid inlet end. A second liquid inlet end is formed on the side of the expansion assembly away from the first liquid inlet end.

[0008] An anti-drip assembly is disposed in the cavity with its two ends located inside the first liquid inlet and the second liquid inlet, respectively. The anti-drip assembly has a first state that allows electrolyte to enter the cavity from the second liquid inlet and a second state that prevents electrolyte from entering the cavity from the second liquid inlet. The first state is used for liquid injection, and the second state is used for blocking electrolyte.

[0009] In some embodiments, the anti-drip assembly includes a rod, a slider, and an elastic element. The two ends of the rod are respectively disposed in the first liquid inlet and the second liquid inlet. The slider is disposed outside the rod and can move on the rod. One end of the elastic element is fixed to the side of the slider near the first liquid inlet, and the other end of the elastic element abuts against the first liquid inlet. The outer diameter of the slider is greater than or equal to the diameter of the second liquid inlet. When the slider moves away from the second liquid inlet, it constitutes the first state. When the slider moves to block the second liquid inlet, it constitutes the second state.

[0010] In some embodiments, the anti-drip assembly further includes a first seal disposed on the side of the slider near the second inlet end.

[0011] In some embodiments, the anti-drip assembly further includes a plug, which is fixed to the side of the plug near the second liquid inlet end, and the outer diameter of the plug is smaller than the diameter of the second liquid inlet end.

[0012] In some embodiments, the plug has an overflow groove that radially penetrates the plug on its side surface away from the plug rod.

[0013] In some embodiments, the anti-drip assembly further includes a second seal disposed on the side of the plug away from the second inlet end.

[0014] In some embodiments, the anti-drip assembly further includes a limiting member disposed on the side of the insert near the first liquid inlet end, and the other end of the elastic member abuts against the limiting member.

[0015] In some embodiments, the expansion assembly includes a first connecting pipe, a second connecting pipe, and a cylinder. The internal space of the cylinder forms the cavity. One end of the cylinder is sleeved on the first liquid inlet end. The first connecting pipe and the second connecting pipe are sequentially disposed at the other end of the cylinder. The first connecting pipe forms the second liquid inlet end.

[0016] In some embodiments, the expansion assembly further includes a third seal, which is disposed at the connection between the cylinder and the first liquid inlet end, for sealing the expansion assembly and the needle body.

[0017] On the other hand, this utility model provides a battery liquid injection device, including a liquid storage tank, a liquid delivery pipeline and the anti-drip injection nozzle mentioned above, wherein the two ends of the liquid delivery pipeline are respectively connected to the liquid storage tank and the anti-drip injection nozzle.

[0018] Compared with the prior art, the beneficial effects of this utility model mainly include:

[0019] The anti-drip injection nozzle provided by this utility model has an expansion component set at the first liquid inlet end of the nozzle body, and an anti-drip component set in the cavity of the expansion component. The anti-drip component has a first state for liquid injection and a second state for blocking electrolyte. In the first state, the battery can be injected with electrolyte, and in the second state, the electrolyte can be blocked from entering the nozzle. Thus, after a single liquid injection, the anti-drip component can block the electrolyte, minimizing the electrolyte residue in the nozzle, thereby minimizing the corrosion of the battery cell surface by the electrolyte and reducing the probability of defective battery cells. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the anti-drip injection needle of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the needle tip body described in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the capacity expansion component described in this utility model;

[0023] Figure 4 This is a schematic diagram of the anti-drip component of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Needle body; 110. Sleeve; 120. First needle; 130. Second needle; 140. Fastener;

[0026] 200, expansion assembly; 201, cavity; 210, first connecting pipe; 220, second connecting pipe; 230, cylinder; 240, third sealing element;

[0027] 300. Anti-drip assembly; 310. Insert rod; 320. Slider; 330. Elastic element; 340. First seal; 350. Plug; 351. Overflow groove; 360. Second seal; 370. Limiting element. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] This invention addresses the technical problem that existing injection nozzles still have a large amount of electrolyte flowing out after injection, which corrodes the surface of the battery cell and increases the probability of defective battery cells. It proposes an anti-drip injection nozzle that can minimize electrolyte outflow and thus reduce the defect rate of the product's appearance.

[0030] Please see Figure 1 As shown, this utility model is an anti-drip injection needle, including a needle body 100, a capacity expansion component 200, and an anti-drip component 300. The needle body 100 has a first inlet end; the capacity expansion component 200 is sealed and connected to the first inlet end, and a cavity 201 is formed inside the capacity expansion component 200, the cavity 201 is connected to the first inlet end, and a second inlet end is formed on the side of the capacity expansion component 200 away from the first inlet end; the anti-drip component 300 is disposed in the cavity 201 and its two ends are respectively located inside the first inlet end and the second inlet end. The anti-drip component 300 has a first state that allows electrolyte to enter the cavity 201 from the second inlet end and a second state that prevents electrolyte from entering the cavity 201 from the second inlet end. The first state is used for injection, and the second state is used for blocking electrolyte.

[0031] This invention provides an expansion component 200 at one end of the nozzle body 100, and an anti-drip component 300 in the cavity 201 of the expansion component 200. The anti-drip component 300 is configured to have a first state for injecting electrolyte and a second state for blocking electrolyte. In the first state, the anti-drip component 300 enables the injection nozzle to inject electrolyte into the battery, and in the second state, it blocks electrolyte from entering the nozzle. After a single injection, the anti-drip component 300 can block electrolyte, minimizing the amount of electrolyte remaining in the nozzle, thereby minimizing electrolyte corrosion on the cell surface and reducing the probability of defective cells.

[0032] In one embodiment, such as Figure 2 As shown, the needle body 100 includes a sleeve 110, a first needle 120, a second needle 130, and a fastener 140. The sleeve 110, the first needle 120, and the second needle 130 are connected in sequence. The end of the sleeve 110 away from the first needle 120 forms the first liquid inlet end, which is used to connect the expansion assembly 200. The fastener 140 is disposed at the connection between the sleeve 110 and the first needle 120, and is used to fix the sleeve 110 and the first needle 120 together.

[0033] In one embodiment, the first needle tip 120 and the second needle tip 130 are preferably integrally formed, and the diameter of the first needle tip 120 is slightly larger than the diameter of the second needle tip 130.

[0034] In one embodiment, such as Figure 3 As shown, the expansion assembly 200 includes a first connecting pipe 210, a second connecting pipe 220, and a cylinder 230. The internal space of the cylinder 230 forms the cavity 201. One end of the cylinder 230 is sleeved on the first liquid inlet end, that is, one end of the cylinder 230 is sleeved on the end of the sleeve 110 away from the first needle nozzle 120. The first connecting pipe 210 and the second connecting pipe 220 are sequentially arranged at the other end of the cylinder. The first connecting pipe 210 constitutes the second liquid inlet end, specifically, the end of the first connecting pipe 210 away from the second connecting pipe 220 constitutes the second liquid inlet end.

[0035] In one embodiment, the diameters of the cylinder 230, the first connecting pipe 210, and the second connecting pipe 220 decrease sequentially, and the diameter of the second connecting pipe 220 is to match the diameter of the infusion pipe of the external liquid storage device.

[0036] In one embodiment, the expansion assembly 200 further includes a third seal 240, which is disposed at the connection between the cylinder 230 and the first liquid inlet end, for sealing the expansion assembly 200 and the needle body 100.

[0037] In one embodiment, such as Figure 4 As shown, the anti-drip assembly 300 includes a rod 310, a slider 320, and an elastic element 330. The two ends of the rod 310 are respectively disposed in the first liquid inlet end and the second liquid inlet end, that is, the two ends of the rod 310 are respectively disposed in the first connecting pipe 210 and the sleeve 110. The slider 320 is disposed outside the rod 310 and can move on the rod 310. One end of the elastic element 330 is fixed to the side of the slider 320 near the first liquid inlet end, and the other end of the elastic element 330 abuts against the first liquid inlet end.

[0038] In the above technical solution, the outer diameter of the slider 320 must be greater than or equal to the diameter of the second liquid inlet, that is, greater than the diameter of the first connecting pipe 210. When the slider 320 moves close to the first connecting pipe 210, it can block the edge of the opening of the first connecting pipe 210 to form a second state of electrolyte isolation. Conversely, when the slider 320 moves away from the first connecting pipe 210, the isolation of the electrolyte is released, and the electrolyte enters the cavity 201 to form the first state of liquid injection operation.

[0039] In one embodiment, the anti-drip assembly 300 further includes a first seal 340 disposed on the side of the slider 320 near the second liquid inlet end. When the slider 320 moves to the second state near the second liquid inlet end, the first seal 340 enhances the barrier effect against the electrolyte.

[0040] In one embodiment, the anti-drip assembly 300 further includes a plug 350, which is fixed to the side of the plug 310 near the second liquid inlet end. The outer diameter of the plug 350 is smaller than the diameter of the second liquid inlet end, that is, smaller than the diameter of the first connecting tube 210.

[0041] In one embodiment, the plug 350 has an overflow groove 351 that radially penetrates the plug 350 on the side surface away from the plug rod 310, which facilitates the flow of electrolyte from the first connecting pipe 210 into the cavity 201.

[0042] In one embodiment, the anti-drip assembly 300 further includes a second seal 360 disposed on the side of the plug 350 away from the second liquid inlet.

[0043] In one embodiment, the anti-drip assembly 300 further includes a limiting member 370, which is disposed on the side of the insert 310 near the first liquid inlet end, and the other end of the elastic member 330 abuts against the limiting member 370.

[0044] It should be noted that the first sealing element 340, the second sealing element 360 and the third sealing element 240 are rubber sealing rings with different diameters; the limiting element 370 is a nut, and correspondingly, the insertion rod 310 is provided with a thread that mates with it.

[0045] In addition, this utility model also provides a battery liquid injection device, which includes a liquid storage tank, a liquid delivery pipeline and the anti-drip injection needle of this utility model. The two ends of the liquid delivery pipeline are respectively connected to the liquid storage tank and the anti-drip injection needle.

[0046] The working principle of this utility model is as follows:

[0047] In use, the second connecting pipe 220 is connected to the infusion pipeline. When liquid injection is required, the corresponding control valve is opened so that the electrolyte enters the second connecting pipe 220 from the storage tank through the infusion pipeline, and then enters the first connecting pipe 210. At this time, due to the pressure of the electrolyte, the slider 320 can be pushed to move away from the first connecting pipe 210, so the second inlet end is opened and the electrolyte enters the cavity 201. The cavity 201 is connected to the sleeve 110 of the needle body 100, and then the electrolyte enters the sleeve 110 from the cavity 201, and then enters the first needle 120 and the second needle 130 in sequence, and finally sprays out from the end of the second needle 130. After the injection is completed, the corresponding control valve is closed, and the electrolyte is blocked in the pipeline before the control valve. The electrolyte in the pipeline between the control valve and the needle body 100 is blocked by the anti-drip assembly 300. Specifically, since the control valve is closed, the thrust of the electrolyte is reduced until it disappears. Then, the slider 320, which has moved away from the first connecting pipe 210, moves towards the first connecting pipe 210 under the action of the elastic member 330 until the slider 320 is in contact with the first connecting pipe 210. At this time, the electrolyte can be blocked from entering the cavity 201 under the sealing action of the first sealing member 340. Therefore, the electrolyte remaining in the needle body 100 can be minimized.

[0048] In summary, when the anti-drip injection nozzle provided by this utility model is applied to a battery injection device, the electrolyte residue remaining in the nozzle body 100 can be minimized after injection, thereby reducing corrosion to the battery cell's appearance.

[0049] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A drip-proof injection needle, characterized in that, include: A needle tip body, wherein the needle tip body has a first liquid inlet end; An expansion assembly is sealed to the first liquid inlet end. A cavity is formed inside the expansion assembly, and the cavity is connected to the first liquid inlet end. A second liquid inlet end is formed on the side of the expansion assembly away from the first liquid inlet end. An anti-drip assembly is disposed in the cavity with its two ends located inside the first liquid inlet and the second liquid inlet, respectively. The anti-drip assembly has a first state that allows electrolyte to enter the cavity from the second liquid inlet and a second state that prevents electrolyte from entering the cavity from the second liquid inlet. The first state is used for liquid injection, and the second state is used for blocking electrolyte.

2. The anti-drip injection needle nozzle according to claim 1, characterized in that, The anti-drip assembly includes a rod, a slider, and an elastic element. The two ends of the rod are respectively disposed in the first liquid inlet and the second liquid inlet. The slider is disposed outside the rod and is movable on the rod. One end of the elastic element is fixed to the side of the slider near the first liquid inlet, and the other end of the elastic element abuts against the first liquid inlet. The outer diameter of the slider is greater than or equal to the diameter of the second liquid inlet. The first state is formed when the slider moves away from the second liquid inlet, and the second state is formed when the slider moves to block the second liquid inlet.

3. The anti-drip injection needle nozzle according to claim 2, characterized in that, The anti-drip assembly further includes a first seal, which is disposed on the side of the slider near the second liquid inlet end.

4. The anti-drip injection needle nozzle according to claim 2, characterized in that, The anti-drip assembly also includes a plug, which is fixed to the side of the plug near the second liquid inlet end, and the outer diameter of the plug is smaller than the diameter of the second liquid inlet end.

5. The anti-drip injection needle nozzle according to claim 4, characterized in that, An overflow groove is formed on the side of the plug away from the insertion rod, which extends radially through the plug.

6. The anti-drip injection needle nozzle according to claim 4, characterized in that, The anti-drip assembly further includes a second seal, which is disposed on the side of the plug away from the second liquid inlet.

7. The anti-drip injection needle nozzle according to claim 2, characterized in that, The anti-drip assembly also includes a limiting member, which is disposed on the side of the insert near the first liquid inlet end, and the other end of the elastic member abuts against the limiting member.

8. The anti-drip injection needle nozzle according to claim 1, characterized in that, The expansion assembly includes a first connecting pipe, a second connecting pipe, and a cylinder. The internal space of the cylinder forms the cavity. One end of the cylinder is sleeved on the first liquid inlet end. The first connecting pipe and the second connecting pipe are sequentially arranged at the other end of the cylinder. The first connecting pipe forms the second liquid inlet end.

9. The anti-drip injection needle nozzle according to claim 8, characterized in that, The expansion assembly also includes a third sealing element, which is disposed at the connection between the cylinder and the first liquid inlet end, and is used to seal the expansion assembly and the needle body.

10. A battery electrolyte filling device, characterized in that, The invention includes a storage tank, an infusion pipeline, and an anti-drip injection needle according to any one of claims 1-9, wherein the two ends of the infusion pipeline are respectively connected to the storage tank and the anti-drip injection needle.

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