Liquid injection assembly and liquid injection machine

Abstract

The utility model provides a liquid injection assembly and a liquid injection machine, and relates to the technical field of lithium battery production. According to the liquid injection assembly provided by the utility model, the supporting part on the sealing nozzle can abut against the battery cell, so that the elastic force of the elastic piece is overcome to rise, then the sealing nozzle is abutted to rise, the rising of the sealing nozzle enables the sealing nozzle to be separated from the sealing section, a gap for electrolyte to pass through is formed, and the requirement of the liquid injection process is met. And when the supporting part on the sealing nozzle does not abut against the battery cell any more, the sealing nozzle is reset under the action of the elastic force of the elastic piece and abuts against the sealing section again, so that an original gap for circulation of the electrolyte is eliminated, and sealing of the electrolyte injection assembly is achieved. Compared with liquid injection equipment in the prior art, the liquid injection assembly provided by the invention can effectively avoid the situation that the battery cell absorbs the electrolyte poorly due to the fact that the electrolyte overflows from the liquid injection assembly before and after liquid injection.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery production, and in particular to a liquid injection assembly and a liquid injection machine. Background Art

[0002] Liquid injection equipment is a common process used in lithium battery manufacturing. It primarily uses positive and negative pressure cycles to transfer electrolyte from the cup into the battery cell. A sealed liquid injection nozzle is designed at the junction of the cup and the battery cell. Because the liquid injection equipment comes into contact with the electrolyte, a poor seal can cause electrolyte to overflow from the nozzle, leading to poor electrolyte absorption by the battery cell. Spilled electrolyte can also contaminate the injection jig or the battery cell, causing cross-contamination of the battery cells, affecting their appearance, and resulting in a low quality coating rate. Utility Model Content

[0003] In view of this, the present application provides a liquid injection assembly and a liquid injection machine, the purpose of which is to solve the above technical problems to a certain extent.

[0004] The present application provides a liquid injection assembly, which includes:

[0005] The housing has a cavity located therein, the liquid injection assembly has a liquid injection direction, and the cavity is provided with a first opening and a second opening along the liquid injection direction; the cavity has an inner sidewall, a portion of the inner sidewall forms a sealing section, and the sealing section is provided around the second opening;

[0006] a sealing nozzle and an elastic member, both of which are disposed in the cavity, the elastic member being connected to the cavity wall, the sealing nozzle being connected to the elastic member and being movable along the injection direction, the sealing nozzle being provided with a support portion which passes through and protrudes from the second opening;

[0007] The elastic member causes the sealing nozzle to abut against the sealing section, and when the sealing nozzle abuts against the sealing section, the cavity is separated from the second opening;

[0008] The support portion can push the sealing nozzle away from the sealing section. When the sealing nozzle is separated from the sealing section, a gap for fluid to flow through is formed between the sealing nozzle and the sealing section, and the cavity is connected to the second opening.

[0009] Preferably, the sealing section is arranged in a funnel shape.

[0010] Preferably, the sealing segment includes a first frustum surface, and the outer wall of the sealing nozzle has a second frustum surface matching the sealing segment.

[0011] Preferably, the outer wall of the sealing nozzle abuts against the sealing section in a surface contact manner.

[0012] Preferably, the liquid injection assembly further comprises a liquid injection portion, the liquid injection portion being connected to a side of the sealing nozzle facing away from the elastic member and extending into the second opening;

[0013] The liquid injection portion further comprises a hollow portion provided in the liquid injection portion, and a through hole provided on a side wall of the liquid injection portion; the through hole is connected to the outside through the hollow portion;

[0014] When the sealing nozzle is separated from the sealing segment, the through hole is exposed to the gap and communicates with the cavity.

[0015] Preferably, the liquid injection portion at least partially protrudes from the second opening so as to be located outside the cavity; and the supporting portion is provided at the protruding portion of the liquid injection portion.

[0016] Preferably, the shell includes a boss protruding from one side of the shell in the liquid injection direction; and the second opening is provided on the boss.

[0017] Preferably, the shell includes a first shell portion and a second shell portion detachably connected in the liquid injection direction, the first shell portion has the first opening, the second shell portion has the second opening, and the first shell portion and the second shell portion together enclose the cavity;

[0018] The first shell portion has an embedded portion, and the embedded portion is used to be embedded with the elastic member to position the elastic member.

[0019] Preferably, the end portion of the elastic member is connected to the sealing nozzle by heat melting to form an integral structure.

[0020] In a second aspect, the present application provides a liquid injection machine, which includes the liquid injection assembly as described above.

[0021] According to the liquid injection assembly provided herein, the support portion of the sealing nozzle can abut against the battery cell, thereby overcoming the elastic force of the elastic member and causing the sealing nozzle to rise. This rise causes the sealing nozzle to separate from the sealing section, thereby forming a gap for electrolyte to pass through, meeting the requirements of the liquid injection process. When the support portion of the sealing nozzle no longer abuts the battery cell, the elastic force of the elastic member resets the sealing nozzle and re-engages it against the sealing section, thereby eliminating the gap previously allowing electrolyte to flow and achieving a seal for the liquid injection assembly.

[0022] Compared with the liquid injection equipment in the prior art, the liquid injection assembly provided in accordance with the present application can effectively avoid the poor absorption of electrolyte by the battery cell caused by the electrolyte overflowing from the liquid injection assembly before and after liquid injection.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A cross-sectional schematic diagram of a liquid injection assembly provided according to an embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram of an exploded view of a liquid injection assembly provided according to an embodiment of the present application is shown.

[0027] Reference numerals:

[0028] 100-shell; 110-first shell; 111-first opening; 112-embedded portion; 120-second shell; 121-second opening; 122-boss; 130-cavity; 131-sealing section; 132-first conical surface; 200-elastic member; 300-sealing nozzle; 310-second conical surface; 400-liquid injection portion; 410-hollow portion; 420-through hole; 430-support portion; F-liquid injection direction. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] According to the first aspect of the embodiment of the present application, a liquid injection component is provided. Figure 1 and Figure 2 The structure and working principle of the liquid injection component are described in detail.

[0034] According to a first aspect of the present application, a liquid injection assembly is provided, comprising a housing 100, a sealing nozzle 300, and an elastic member 200. In an embodiment, the housing 100 has a cavity 130 located therein, the liquid injection assembly has an injection direction F, the cavity 130 is provided with a first opening 111 and a second opening 121 along the injection direction F, the cavity 130 has an inner sidewall, a portion of which forms a sealing section 131, and the sealing section 131 is disposed around the second opening 121.

[0035] In an embodiment, the sealing nozzle 300 and the elastic member 200 are both arranged in the cavity 130, the elastic member 200 is connected to the wall of the cavity 130, the sealing nozzle 300 is connected to the elastic member 200 and can move along the injection direction F, and a support portion 430 is provided on the sealing nozzle 300, which passes through and protrudes from the second opening 121.

[0036] In the embodiment, the elastic member 200 causes the sealing nozzle 300 to abut against the sealing segment 131 . When the sealing nozzle 300 abuts against the sealing segment 131 , the cavity 130 is separated from the second opening 121 .

[0037] In an embodiment, the support portion 430 can push the sealing nozzle 300 away from the sealing section 131 . When the sealing nozzle 300 is separated from the sealing section 131 , a gap for fluid to flow through is formed between the sealing nozzle 300 and the sealing section 131 , and the cavity 130 is connected to the second opening 121 .

[0038] Thus, according to an embodiment of the present application, a liquid injection assembly is provided in which the support portion 430 on the sealing nozzle 300 can abut against the battery cell, thereby overcoming the elastic force of the elastic member 200 and causing the sealing nozzle 300 to rise. The rising sealing nozzle 300 separates the sealing nozzle 300 from the sealing section 131, thereby forming a gap for electrolyte to pass through and meeting the requirements of the liquid injection process. When the support portion 430 on the sealing nozzle 300 no longer abuts the battery cell, the sealing nozzle 300 is reset under the elastic force of the elastic member 200 and re-abuts against the sealing section 131, thereby eliminating the original gap for electrolyte flow and achieving a seal for the liquid injection assembly.

[0039] Compared with the liquid injection equipment in the prior art, the liquid injection assembly provided according to the embodiment of the present application can effectively avoid the poor absorption of electrolyte by the battery cell caused by the electrolyte overflowing from the liquid injection assembly before and after liquid injection.

[0040] In an embodiment, the support portion 430 of the sealing nozzle 300 may be, for example, cylindrical or annular, and may be, for example, a hollow structure. In an embodiment, the sidewall of the liquid injection portion 400 described later may have through-holes 420 extending therethrough. These through-holes 420 can communicate with the hollow structure within the support portion 430, thereby allowing electrolyte that has flowed through the gap to the outside of the support portion 430 to enter the support portion 430 through these through-holes 420, thereby flowing from the liquid injection portion 400 into the support portion 430 and then into the battery cells.

[0041] In an embodiment, the elastic member 200 can be, for example, a coil spring, which can be pre-compressed to abut the sealing nozzle 300. In other words, the coil spring continuously applies a downward abutting force to the sealing nozzle 300, thereby ensuring that the sealing nozzle 300 and the sealing section 131 maintain a sealed abutment relationship. In an embodiment, the coil spring is hollow in the middle, which facilitates positioning of the coil spring and reduces the impact on electrolyte flow while applying elastic force to the sealing nozzle 300.

[0042] like Figure 1 As shown, in the embodiment, the liquid injection assembly can be arranged in a vertical direction during use. When the sealing section 131 abuts the sealing nozzle 300, when the sealing nozzle 300 rises, the sealing nozzle 300 and the sealing section 131 are separated, and when the sealing nozzle 300 descends, the sealing nozzle 300 abuts the sealing section 131.

[0043] Combine Figure 1 , and see Figure 2 In an embodiment, the sealing section 131 may be funnel-shaped. That is, the area of ​​the upper opening of the sealing section 131 is larger than that of the lower opening, presenting a structure with a larger upper opening and a smaller lower opening.

[0044] Still see Figure 2 In an embodiment, the sealing segment 131 may include a first conical surface 132, and the outer wall of the sealing nozzle 300 may have a second conical surface 310 that matches the sealing segment 131. In an embodiment, the first conical surface 132 is formed as a substantially inner conical surface, which is surrounded by the upper and lower openings described above. Therefore, the upper opening has a larger diameter than the lower opening.

[0045] In an embodiment, the second conical surface 310 is a substantially outer conical surface. In an embodiment, the second conical surface 310 can have the same taper as the first conical surface 132. In terms of axial length, that is, height, the second conical surface 310 of the sealing nozzle 300 can be smaller. Thus, the diameter of the upper end surface of the second conical surface 310 of the sealing nozzle 300 is smaller than the diameter of the upper opening of the sealing segment 131. When the sealing nozzle 300 is raised, this diameter difference creates an annular gap between the upper end surface of the second conical surface 310 of the sealing nozzle 300 and the upper opening of the sealing segment 131. The electrolyte can then flow through the annular gap into the gap between the first conical surface 132 and the second conical surface 310, thereby enabling further flow of the electrolyte toward the support portion 430.

[0046] In an embodiment, the portion of the cavity 130 located above the sealing segment 131 may be, for example, in the shape of an inner cylinder, the inner diameter of which is the same as the inner diameter of the opening on the upper side of the sealing segment 131 .

[0047] According to the liquid injection assembly provided in the embodiment of the present application, the outer wall of the sealing nozzle 300 can abut the sealing section 131 in a surface-contact manner. In the example described above, the contact formed by the first frustum surface 132 and the second frustum surface 310 is essentially surface contact. Sealing by surface contact can improve the reliability of the electrolyte seal. In other examples, the sealing section 131 can also be a stepped structure, and the outer wall of the sealing nozzle 300 can also be a stepped structure. The stepped structure abuts against the stepped structure to form an annular joint surface to seal the electrolyte.

[0048] According to the liquid injection assembly provided in an embodiment of the present application, the liquid injection portion 400 of the liquid injection assembly extends into the second opening 121. The liquid injection portion can be, for example, a cylindrical structure. As mentioned above, the liquid injection portion 400 further includes a hollow portion 410 disposed therein and a through hole 420 disposed on the sidewall of the liquid injection portion 400. In the embodiment, the through hole 420 communicates with the outside world through the hollow portion 410. When the sealing nozzle 300 is separated from the sealing section 131, the through hole 420 is exposed to the gap and communicates with the cavity 130.

[0049] In the embodiment, the liquid injection portion 400 is substantially disposed between the support portion 430 and the sealing nozzle 300. Figure 1 In the example provided, the liquid injection portion 400 may protrude from the second opening 121, and the support portion 430 is disposed on this protruding portion protruding from the second opening 121. In the embodiment, the hollow portion 410 of the liquid injection portion 400 and the hollow structure of the support portion 430 are connected. Specifically, the inner diameters may be the same. Therefore, according to the liquid injection assembly provided in the embodiment of the present application, the hollow structure of the support portion 430 can communicate with the through hole 420.

[0050] In addition, in the embodiment, a portion of the support portion 430 protrudes from the second opening 121 to be located outside the cavity 130. As a result, the exposed support portion 430 may first abut against the battery cell, thereby pushing the entire sealing nozzle 300 upward to overcome the elastic force of the elastic member 200.

[0051] In an embodiment, the housing 100 may further include a boss 122. The boss 122 may protrude from one side of the housing 100 in the liquid injection direction F, and the second opening 121 may be provided on the boss 122. Figure 2 As shown, in the embodiment, the boss 122 provides better stability for the liquid injection assembly when it abuts against the battery cell.

[0052] In an embodiment, the shell 100 may include a first shell portion 110 and a second shell portion 120 detachably connected in the injection direction F, the first shell portion 110 may have a first opening 111, the second shell portion 120 may have a second opening 121, and the first shell portion 110 and the second shell portion 120 together enclose a cavity 130.

[0053] In an embodiment, the first shell 110 may have an embedding portion 112, which may be formed, for example, as a cylindrical protrusion. The embedding portion 112 may be used to engage with the elastic member 200 (i.e., the hollow portion 410 of the coil spring may be sleeved onto the outside of the embedding portion 112) to position the elastic member 200. In an embodiment, the cavity 130 extends downward through the first shell 110 from the location of the first opening 111. In other words, the lower end surface of the embedding portion 112 also has an open hole to allow electrolyte to flow.

[0054] In this embodiment, in addition to the sealing section 131 described above, the first shell 110 also includes a cylindrical hollow portion 410 located above the sealing section 131, as described above. In this embodiment, the end of the elastic member 200 is heat-sealably connected to the sealing nozzle 300 to form an integrated structure. This allows for pre-assembly of the two components via heat smelting, simplifying the assembly process of the injection molded component.

[0055] According to the second aspect of the embodiment of the present application, a liquid injection machine is provided. The liquid injection machine may include the liquid injection assembly as described above and also has the beneficial effects as described above, which will not be repeated here.

[0056] The above are only preferred embodiments of the present application and do not limit the scope of protection of the present application. All equivalent structural transformations made based on the contents of the present application specification and drawings under the innovative concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A liquid injection component, characterized in that: The liquid injection component includes: A housing (100), the housing (100) having a cavity (130) located within the housing (100), the liquid injection assembly having a liquid injection direction (F), the cavity (130) being provided with a first opening (111) and a second opening (121) along the liquid injection direction (F); the cavity having an inner sidewall, a portion of the inner sidewall forming a sealing section (131), the sealing section (131) being provided around the second opening; a sealing nozzle (300) and an elastic member (200), wherein the sealing nozzle (300) and the elastic member (200) are both arranged in the cavity (130), the elastic member is connected to the wall of the cavity (130), the sealing nozzle (300) is connected to the elastic member (200) and is movable along the injection direction (F), and a supporting portion (430) is provided on the sealing nozzle (300), the supporting portion passing through and protruding from the second opening (121); The elastic member (200) causes the sealing nozzle (300) to abut against the sealing section (131); when the sealing nozzle (300) abuts against the sealing section (131), the cavity (130) is separated from the second opening (121); The support portion (430) is capable of pushing the sealing nozzle (300) away from the sealing section (131); when the sealing nozzle (300) is separated from the sealing section (131), a gap is formed between the sealing nozzle (300) and the sealing section (131) for fluid to flow through, and the cavity (130) is connected to the second opening (121).

2. The liquid injection assembly according to claim 1, characterized in that: The sealing section (131) is arranged in a funnel shape.

3. The liquid injection assembly according to claim 2, characterized in that: The sealing section (131) includes a first frustoconical surface (132), and the outer wall of the sealing nozzle (300) has a second frustoconical surface (310) matching the sealing section (131).

4. The liquid injection assembly according to claim 1, characterized in that: The outer wall of the sealing nozzle (300) abuts against the sealing section (131) in a surface contact manner.

5. The liquid injection assembly according to claim 1, characterized in that: The liquid injection assembly further comprises a liquid injection portion (400), wherein the liquid injection portion (400) is connected to a side of the sealing nozzle (300) facing away from the elastic member (200) and extends into the second opening; The liquid injection portion (400) further comprises a hollow portion (410) disposed within the liquid injection portion (400), and a through hole (420) disposed on a side wall of the liquid injection portion (400); the through hole is connected to the outside through the hollow portion (410); When the sealing nozzle (300) is separated from the sealing section, the through hole (420) is exposed to the gap and communicates with the cavity (130).

6. The liquid injection assembly according to claim 5, characterized in that: The liquid injection portion (400) at least partially protrudes from the second opening (121) so as to be located outside the cavity (130); and the supporting portion (430) is provided on the protruding portion of the liquid injection portion (400).

7. The liquid injection assembly according to claim 6, characterized in that: The housing (100) comprises a boss (122) protruding from one side of the housing (100) in the liquid injection direction (F); the second opening (121) is provided on the boss (122).

8. The liquid injection assembly according to any one of claims 1 to 7, characterized in that: The housing (100) comprises a first housing portion (110) and a second housing portion (120) detachably connected in a liquid injection direction (F); the first housing portion (110) has the first opening (111); the second housing portion (120) has the second opening (121); the first housing portion and the second housing portion together enclose the cavity (130); The first shell portion (110) has an embedded portion (112), and the embedded portion (112) is used to be embedded with the elastic member (200) to position the elastic member (200).

9. The liquid injection assembly according to any one of claims 1 to 7, characterized in that: The end of the elastic member (200) is connected to the sealing nozzle (300) by heat melting to form an integrated structure.

10. A liquid injection machine, characterized in that: The liquid filling machine includes the liquid filling assembly according to any one of claims 1 to 9.

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