Liquid injection nozzle

Abstract

The utility model provides a liquid injection nozzle and relates to the technical field of battery production. Comprising a liquid injection nozzle outer sleeve body, a liquid injection channel penetrating through two opposite end faces is formed in the middle of the outer sleeve body, a liquid injection block is installed in the liquid injection channel, a plurality of through holes penetrating through the two opposite end faces of the liquid injection block are formed in the liquid injection block, and the extending direction of the through holes is the same as the extending direction of the liquid injection channel; a leakage-proof layer film is arranged on the end face, provided with a through hole opening, of the liquid injection block, a plurality of kerfs are formed in the leakage-proof layer film, the kerfs can be elastically opened under pressure and can be elastically closed under no pressure, and the kerfs are located at the position of the through hole. The electrolyte injection device has the beneficial effects that the electrolyte injection amount is accurate, and the electrolyte is prevented from sliding off to pollute a battery shell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a liquid injection nozzle. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Lithium batteries need to be injected during the production process. Injection refers to the process of controlling the amount and injection time of liquid electrolyte so that the liquid electrolyte is injected into the battery from the injection port.

[0003] Currently, liquid injection is performed by aligning the injection nozzle of the injection machine with the injection hole on the battery, and the injection machine injects electrolyte into the injection hole of the battery through the injection nozzle. After the electrolyte injection is completed, some electrolyte usually remains at the mouth of the injection nozzle, causing deviations in the amount of electrolyte injected into the battery and electrolyte dripping from the mouth of the injection nozzle onto the battery shell, affecting the appearance and yield. Manual wiping is required after the injection.

[0004] In response to the above problems, the current improvement is to install a leak-proof layer membrane with a gap in the filling nozzle. During injection, the electrolyte passes through the gap of the leak-proof layer membrane in the filling nozzle under the action of hydraulic pressure. Injecting liquid through the gap of the leak-proof layer membrane can reduce the loss of electrolyte and prevent pollution caused by dripping of electrolyte.

[0005] However, due to the presence of the leak-proof membrane, resistance is applied to the injection of the electrolyte when the electrolyte is injected into the battery from the injection nozzle. The electrolyte needs to overcome the resistance at the gap of the leak-proof membrane before it can be injected into the battery, and the leak-proof membrane is laid horizontally in the injection channel of the entire injection nozzle. When the injection machine injects electrolyte into the injection nozzle and reaches the leak-proof membrane, only the electrolyte at the gap can pass smoothly, and the electrolyte not at the gap still cannot pass under the action of hydraulic pressure, resulting in injection difficulties. When the injection is completed, electrolyte is still accumulated in the infusion channel, resulting in the problem of excessive deviation in the electrolyte injection amount. Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the above-mentioned prior art and to propose a liquid injection nozzle, which increases the hydraulic pressure at the gap of the leak-proof layer membrane to allow the electrolyte to pass through quickly, thereby avoiding the leak-proof layer membrane causing resistance to the electrolyte injection and thus causing excessive deviation in the injection amount.

[0007] The utility model proposes an injection nozzle, the improvement of which lies in: comprising an injection nozzle jacket, the injection nozzle jacket having an injection channel penetrating two opposite end faces in the middle, an injection block installed in the injection channel, the injection block having a plurality of through holes penetrating two opposite end faces of the injection block, the extension direction of the through holes being the same as the extension direction of the injection channel; an anti-leakage layer membrane is arranged on an end face of the injection block having a through hole opening, the anti-leakage layer membrane having a plurality of slits, the slits can be elastically opened when subjected to pressure, and can be elastically closed when there is no pressure, and the slits are located at the through holes.

[0008] A more preferred technical solution of the utility model is that the diameter of the through hole gradually decreases in the direction toward the anti-leakage layer membrane.

[0009] A more optimal technical solution of the utility model is that the multiple through holes are symmetrically distributed on the liquid injection block.

[0010] A more preferred technical solution of the utility model is that the end surface of the leak-proof layer membrane away from the liquid injection block is a smooth surface.

[0011] A more optimal technical solution of the utility model: the material of the leak-proof layer membrane is PDM or fluororubber.

[0012] A better technical solution of the utility model: the injection nozzle sleeve includes an upper part, a middle part and a lower part which are connected in sequence, the size of the injection channel gradually decreases in the upper part, the middle part and the lower part, and the injection block is located in the injection channel of the lower part.

[0013] A more optimal technical solution of the utility model is that the cross section of the liquid injection channel in the lower part is circular.

[0014] A more optimal technical solution of the utility model is that a wave-shaped protrusion is arranged on the inner wall of the lower part of the outer sleeve of the liquid injection nozzle.

[0015] A more optimal technical solution of the utility model is that a circle of protrusions is arranged at the port of the liquid injection channel at the lower part of the liquid injection nozzle jacket along the circumferential direction of the port.

[0016] A better technical solution of the utility model is that the peripheral wall of the injection channel in the middle of the injection nozzle outer sleeve is an inclined surface, and the two sides of the inclined surface are respectively connected to the upper and lower injection channels.

[0017] The beneficial effect of the utility model is that: the utility model installs an injection block in the injection channel of the injection nozzle, and a through hole is provided on the injection block to guide the electrolyte. The electrolyte contacts the slit of the leak-proof layer membrane through the through hole, and its hydraulic pressure will be increased, making it easier to pass through the slit of the leak-proof layer membrane. The slit on the leak-proof layer membrane is aligned with the through hole on the injection block. Multiple through holes are matched with multiple slits, so that the electrolyte can pass through the slit faster and easier during injection, thereby reducing the deviation of the electrolyte injection amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the utility model and are used together with the description to explain the principles of the utility model. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the utility model, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The utility model is a cross-sectional view of a liquid injection nozzle.

[0020] Figure 2 This is a schematic structural diagram of a liquid injection nozzle of the utility model from another perspective.

[0021] In the figure: 100, liquid injection nozzle jacket; 200, liquid injection block; 300, leak-proof layer membrane; 400, wave-shaped protrusion; 500, protrusion; 101, upper part; 102, middle part; 103, lower part; 201, through hole; 2011, liquid inlet; 2012, liquid outlet; 301, slit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0023] Reference Figure 1 and Figure 2 As shown in , the utility model provides a liquid injection nozzle, including a liquid injection nozzle jacket 100, wherein the liquid injection nozzle jacket has a liquid injection channel penetrating two opposite end faces in the middle, and a liquid injection block 200 is installed in the liquid injection channel, and the liquid injection block 200 is provided with six through holes 201 penetrating two opposite end faces of the liquid injection block 200, and the extension direction of the through holes 201 is the same as the extension direction of the liquid injection channel. A leak-proof layer membrane 300 is provided on one end face of the liquid injection block 200 with the through holes 201 opening, and six slits 301 are provided on the leak-proof layer membrane 300, and the slits 301 can be elastically opened when subjected to pressure, and can be elastically closed when there is no pressure, and the slits 301 are located at the through holes 201.

[0024] The utility model installs an injection block 200 in the injection channel, guides and pressurizes the electrolyte through the through hole 201 on the injection block 200, so that the electrolyte passes through the slit 301 at the leak-proof layer membrane 300 quickly and at high pressure. Compared with the leak-proof layer membrane 300 with a slit directly laid on the injection channel, the electrolyte is easier to pass through the leak-proof layer membrane 300, reducing the resistance of the leak-proof layer membrane 300 to the electrolyte, which causes excessive deviation in the injection amount.

[0025] Furthermore, the diameter of the through hole 201 gradually decreases in the direction toward the leak-proof layer membrane 300, that is, the diameter gradually decreases from the liquid inlet 2011 to the liquid outlet 2012. The smaller diameter can further increase the decompression pressure at the midpoint of the through hole 201, thereby allowing the electrolyte to pass through the slit 301 faster and easier.

[0026] At the same time, the six through holes 201 are symmetrically distributed on the injection block 200, such as Figure 2 As shown in the figure, the six through holes 201 are divided into three groups, and two through holes 201 in each group are symmetrically distributed on the injection block 200. When the injection machine injects electrolyte into the injection channel, the electrolyte is filled in the injection channel. The six through holes 201 are symmetrically distributed in the injection channel, which can evenly guide the electrolyte in the injection channel and improve the injection efficiency.

[0027] The material of the leakproof layer membrane 300 is PDM or fluororubber. When the leakproof layer membrane 300 of this material is provided with the slit opening 301, the slit opening 301 is in a normally closed state, which can be opened when subjected to the hydraulic pressure of the electrolyte, and will automatically close when there is no hydraulic pressure of the electrolyte.

[0028] Although the slit 301 can largely prevent the electrolyte from dripping, there will still be residual electrolyte after the injection is completed, and the residual electrolyte still has the problem of dripping on the battery shell and causing damage. Therefore, the end surface of the anti-leakage layer membrane 300 away from the injection block 200 is a smooth surface to enhance the adhesion of the electrolyte. After the injection is completed, the residual electrolyte is more difficult to drip on the anti-leakage layer membrane 300, thereby avoiding contamination of the battery shell.

[0029] The injection nozzle cover 100 includes an upper part 101, a middle part 102 and a lower part 103 connected in sequence. The size of the injection channel in the upper part 101, the middle part 102 and the lower part 103 gradually decreases, and the injection block 200 is located in the injection channel of the lower part 103. The peripheral wall of the injection channel in the middle part 102 of the injection nozzle cover 100 is an inclined surface, and the two sides of the inclined surface are respectively connected to the injection channels of the upper part 101 and the lower part 103. The upper part 101 of the injection nozzle is connected to the injection machine, and the injection machine introduces electrolyte into the injection nozzle. In the process of the electrolyte moving from the upper part 101 to the middle part 102 and the lower part 103 in the injection channel, the infusion channel gradually narrows, strengthening the hydraulic pressure of the electrolyte, and further increasing the pressure of the electrolyte when passing through the anti-leakage layer membrane 300.

[0030] Meanwhile, the cross section of the injection channel in the lower portion 103 is circular, corresponding to the injection hole on the battery.

[0031] Furthermore, in order to prevent the electrolyte remaining in the injection nozzle from dripping after the injection is completed, a wavy protrusion 400 is provided on the inner wall of the lower part 103 of the injection nozzle cover 100, and a circle of protrusions 500 are provided along the circumferential direction of the port at the port of the injection channel of the lower part 103 of the injection nozzle cover 100. The wavy protrusion 400 and the circle of protrusions 500 provided at the port block the electrolyte remaining on the inner wall of the lower part 103, preventing the electrolyte from dripping quickly onto the battery housing when the injection nozzle is removed, and the electrolyte will not drip easily when the operator adjusts the injection nozzle to prevent the electrolyte from dripping.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A liquid injection nozzle, characterized in that: The invention comprises a liquid injection nozzle jacket (100), wherein the middle of the liquid injection nozzle jacket has a liquid injection channel penetrating two opposite end faces, and a liquid injection block (200) is installed in the liquid injection channel, and the liquid injection block (200) is provided with a plurality of through holes (201) penetrating two opposite end faces of the liquid injection block (200), and the extension direction of the through holes (201) is the same as the extension direction of the liquid injection channel; a leakproof layer membrane (300) is arranged on one end face of the liquid injection block (200) having an opening of the through hole (201), and the leakproof layer membrane (300) is provided with a plurality of slits (301), and the slits (301) can be elastically opened when subjected to pressure, and can be elastically closed when there is no pressure, and the slits (301) are located at the through holes (201).

2. A liquid injection nozzle according to claim 1, characterized in that: The diameter of the through hole (201) gradually decreases in the direction towards the anti-leakage layer membrane (300).

3. A liquid injection nozzle according to claim 1, characterized in that: The multiple through holes (201) are symmetrically distributed on the liquid injection block (200).

4. A liquid injection nozzle according to claim 1, characterized in that: The end surface of the leak-proof layer membrane (300) away from the liquid injection block (200) is a smooth surface.

5. The liquid injection nozzle according to claim 1, characterized in that: The material of the anti-leakage layer membrane (300) is PDM or fluororubber.

6. The liquid injection nozzle according to claim 1, characterized in that: The injection nozzle sleeve (100) comprises an upper portion (101), a middle portion (102) and a lower portion (103) which are connected in sequence, the injection channel has a size that gradually decreases in the upper portion (101), the middle portion (102) and the lower portion (103), and the injection block (200) is located in the injection channel of the lower portion (103).

7. A liquid injection nozzle according to claim 6, characterized in that: The cross section of the injection channel in the lower part (103) is circular.

8. The liquid injection nozzle according to claim 6, characterized in that: A wave-shaped protrusion (400) is provided on the inner wall of the lower portion (103) of the injection nozzle housing (100).

9. The liquid injection nozzle according to claim 7, characterized in that: A circle of protrusions (500) is provided at the port of the liquid injection channel of the lower part (103) of the liquid injection nozzle housing (100) along the circumferential direction of the port.

10. The liquid injection nozzle according to claim 6, characterized in that: The peripheral wall of the liquid injection channel in the middle part (102) of the liquid injection nozzle housing (100) is an inclined surface, and the two sides of the inclined surface are respectively connected to the liquid injection channels in the upper part (101) and the lower part (103).

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