Square battery cell liquid injection needle and liquid injection equipment

Abstract

The utility model discloses a kind of square electric core liquid injection needle and liquid injection equipment, square electric core liquid injection needle includes needle body, needle body is vertically set on the upper side of the opening of the shell of electric core, the upper end of needle body is assembled with the liquid injection pipe of liquid injection equipment and communicates;First liquid-passing hole, second liquid-passing hole are respectively set on the lateral wall of needle body;Square electric core liquid injection needle provided by the utility model, by the setting first liquid-passing hole, second liquid-passing hole of needle body, it is convenient to make liquid injection equipment when liquid injection in the shell of electric core, electrolyte can respectively from first liquid-passing hole, second liquid-passing hole with parabolic trajectory fall into shell, the included angle between the movement direction of electrolyte and the upper surface of roll core is acute angle, to effectively reduce the impact force to roll core single position, simultaneously, because contact angle is acute angle, electrolyte kinetic energy loss is less than right angle contact, more conducive to the flow of electrolyte infiltration, improve infiltration efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a square battery cell liquid injection needle and liquid injection equipment. Background Technology

[0002] With the continuous development of battery application scenarios and performance requirements, battery operating scenarios involve multiple dimensions of needs, including high temperature, low temperature, high capacity, high rate, long cycle time, and long lifespan. Correspondingly, a wide variety of electrolytes are also required. Currently available injection needles are all straight-through injection types, meaning the main function of the injection needle is to guide flow. The injection needle is a hollow straight cylinder with a diameter matching the injection orifice size. The electrolyte injection method is single-point injection, meaning the electrolyte comes from the straight-cylinder injection nozzle of the injection needle, enters the cell through this point, and then diffuses to other parts of the cell from the injection point. Existing injection methods typically have the following problems: increased injection frequency and settling time are required to prevent overflow; injection efficiency is low; injection time is long for low-flow electrolytes; and the large single-point injection flow rate can easily damage the impact point of the core. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies. This utility model provides a square battery cell injection needle and injection device.

[0004] This utility model provides the following technical solution:

[0005] A square battery cell injection needle is installed on an injection device. The square battery cell injection needle includes a needle body.

[0006] The needle body is vertically positioned above the opening on the housing of the battery cell, and the upper end of the needle body is connected to the injection tube of the injection device. A first liquid passage hole and a second liquid passage hole are respectively opened on the side wall of the needle body. The axis of the first liquid passage hole is perpendicular to the wide surface of the housing, and the axis of the second liquid passage hole is perpendicular to the long surface of the housing.

[0007] As a further improvement to the above technical solution, the first liquid passage and the second liquid passage are respectively symmetrically arranged with respect to the axis of the needle body.

[0008] As a further improvement to the above technical solution, the diameter of the first liquid passage is larger than the diameter of the second liquid passage.

[0009] As a further improvement to the above technical solution, the ratio of the opening area of ​​the first liquid passage hole to the opening area of ​​the second liquid passage hole is equal to the ratio of the length of the long side to the length of the wide side of the shell.

[0010] As a further improvement to the above technical solution, at least two of the first liquid passage hole and the second liquid passage hole are provided along the axial direction of the needle body.

[0011] As a further improvement to the above technical solution, the upper end of the needle body is provided with a snap-fit ​​post, which is used to snap-fit ​​and install on the liquid injection device. Two anti-slip protrusions are provided symmetrically on the side wall of the snap-fit ​​post relative to the axis of the needle body. The anti-slip protrusions are used to limit the installation with the mounting part of the liquid injection device.

[0012] As a further improvement to the above technical solution, the cross-section of the anti-slip protrusion is semi-circular, and the axis of the anti-slip protrusion intersects the axis of the first liquid passage hole in the same plane.

[0013] As a further improvement to the above technical solution, the end of the snap-fit ​​post opposite to the needle body is equipped with an infusion tubing, and the two ends of the infusion tubing are respectively connected to the infusion tube of the infusion device and the needle body.

[0014] As a further improvement to the above technical solution, the infusion tubing is a corrugated tube.

[0015] This utility model also provides a liquid injection device, including a square battery cell liquid injection needle as described in any of the above-mentioned embodiments.

[0016] Compared with related technologies, the beneficial effects of this utility model are:

[0017] The square battery cell injection needle provided by this utility model allows for the injection of electrolyte into the battery cell housing. First, the needle is inserted into the injection hole on the battery cell housing. Then, the injection device is activated to deliver electrolyte into the needle. The electrolyte flows out from the first and second through holes and falls into the housing with a projectile motion trajectory. This unique injection method ensures that the electrolyte's movement direction after entering the housing forms an acute angle with the upper surface of the core. This angle design offers significant advantages: firstly, it effectively reduces the direct impact force of the electrolyte on a single location on the core, avoiding potential damage or uneven electrolyte distribution due to excessive impact force; secondly, based on fluid mechanics principles, when the contact angle between the electrolyte and the upper surface of the core is acute, the kinetic energy loss during contact, flow, and wetting is less than in the case of right-angle contact. This means that more electrolyte kinetic energy can be effectively utilized, driving the rapid flow and full wetting of the electrolyte inside the core, thereby significantly improving the electrolyte wetting efficiency.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] 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.

[0020] Figure 1 This diagram shows a schematic view of the square battery cell injection needle in one embodiment of the present invention.

[0021] Figure 2 It shows Figure 1 Enlarged structural diagram at point A;

[0022] Figure 3 This is a schematic diagram of the working state of the square battery cell injection needle in one embodiment of the present invention;

[0023] Figure 4 This invention provides a schematic diagram of the working state of the square battery cell injection needle in one embodiment of the present invention from another perspective.

[0024] Figure 5 A schematic diagram of the working state of a conventional needle in the prior art is shown from one perspective.

[0025] Explanation of key component symbols:

[0026] 100-Needle body; 110-First infusion port; 120-Second infusion port; 200-Battery cell; 210-Housing shell; 211-Wide surface; 212-Long surface; 220-Core; 300-Snap-fit ​​post; 310-Anti-slip ridge; 400-Infusion tubing; 510-First infusion trajectory; 520-Second infusion trajectory; 600-Existing needle; 610-Third infusion trajectory. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In related technologies, the existing needle 600 is typically hollow and cylindrical, with its diameter matching the injection orifice size; such as Figure 5As shown, the electrolyte can enter the battery cell 200 through the opening at the bottom of the needle, and fall onto the core 220 inside the battery cell 200 along the third infusion trajectory 610, and then spread to other positions of the battery cell 200 from the point of electrolyte landing. This infusion process has problems such as low infusion efficiency, large single-point infusion flow rate, and easy damage to the core 220 at the landing point.

[0033] Combination Figure 1 , Figure 2 As shown, an embodiment of this utility model provides a square battery cell injection needle, which is installed on an injection device. The square battery cell injection needle includes a needle body 100.

[0034] The needle body 100 is vertically disposed above the opening on the housing 210 of the battery cell 200. The upper end of the needle body 100 is connected to the injection tube of the injection device, and the lower end of the needle body 100 is in a blocked state. A first liquid passage hole 110 and a second liquid passage hole 120 are respectively opened on the side wall of the needle body 100. The axis of the first liquid passage hole 110 is perpendicular to the wide surface 211 of the housing 210, and the axis of the second liquid passage hole 120 is perpendicular to the long surface 212 of the housing 210, so that the electrolyte discharged from the first liquid passage hole 110 can fall in a direction parallel to the long surface 212, and the electrolyte discharged from the second liquid passage hole 120 can fall in a direction parallel to the wide surface 211.

[0035] The square battery cell injection needle provided in this embodiment, when it is necessary to inject electrolyte into the housing 210 of the battery cell 200, first inserts the needle body 100 into the injection hole on the housing 210 of the battery cell 200, and then starts the injection device to deliver electrolyte into the needle body 100. Figure 3 , Figure 4 As shown, the electrolyte flows out from the first through-hole 110 and the second through-hole 120 respectively, and falls into the housing 210 with a projectile motion trajectory. This unique injection method ensures that the direction of movement of the electrolyte after entering the housing 210 forms an acute angle with the upper surface of the core 220. This angle design brings significant advantages: on the one hand, it effectively reduces the direct impact force of the electrolyte on a single location of the core 220, avoiding damage to the core 220 or uneven electrolyte distribution that may be caused by excessive impact force; on the other hand, from the principle of fluid mechanics, when the contact angle between the electrolyte and the upper surface of the core 220 is acute, the kinetic energy loss of the electrolyte during contact with the core 220 and during flow and wetting is less than that in the case of right-angle contact. This means that more electrolyte kinetic energy can be effectively utilized to promote rapid flow and full wetting of the electrolyte inside the core 220, thereby significantly improving the wetting efficiency of the electrolyte.

[0036] Furthermore, since the axis of the first liquid passage 110 is defined to be perpendicular to the wide surface 211 of the housing 210, and the axis of the second liquid passage 120 is defined to be perpendicular to the long surface 212 of the housing 210, the electrolyte discharged from the first liquid passage 110 can fall in a direction parallel to the long surface 212, and the electrolyte discharged from the second liquid passage 120 can fall in a direction parallel to the wide surface 211. This reduces the probability of the electrolyte colliding with the inner wall of the housing 210 during movement, thereby reducing the kinetic energy loss during the electrolyte falling process and further improving the wetting efficiency of the core 220 inside the housing 210.

[0037] In some specific embodiments, the first liquid passage 110 and the second liquid passage 120 are respectively symmetrically arranged with respect to the axis of the needle body 100. This symmetrical arrangement enables the electrolyte to be evenly sprayed onto the core 220 from four different directions relative to the needle body 100 when the liquid injection device injects electrolyte into the cell 200 through the needle.

[0038] Specifically, because the electrolyte flows out in four directions, the flow rate of the electrolyte in each direction is dispersed compared to traditional single-point or small-volume injection methods. This further reduces the impact force at each electrolyte landing point on the core 220. During battery production, the integrity and performance of the core 220 are crucial; excessive impact force can easily damage the core 220, affecting battery quality and safety. This design, by dispersing the impact force at the electrolyte landing points, significantly reduces the probability of impact damage to the core 220.

[0039] Furthermore, from the perspective of electrolyte wetting of the core 220, this method of spraying electrolyte in four directions allows the electrolyte to contact the surface of the core 220 more extensively. As the electrolyte diffuses on the surface of the core 220, the simultaneous wetting area of ​​the core 220 can be increased, thereby allowing the electrolyte to wet the core 220 more fully and evenly.

[0040] In some specific embodiments, the diameter of the first liquid passage 110 is larger than the diameter of the second liquid passage 120; in the actual rectangular cell 200 structure, the first liquid passage 110 and the second liquid passage 120 correspond to different areas on the core 220 that need to be wetted. Combined with... Figure 3 , Figure 4 The first liquid delivery trajectory 510 of the electrolyte passing through the first liquid passage 110 and the second liquid delivery trajectory 520 of the electrolyte passing through the second liquid passage 120 are shown. The area to be wetted of the core 220 facing the first liquid passage 110 is significantly larger than the area to be wetted of the core 220 facing the second liquid passage 120.

[0041] Given this area difference, using the same diameter through-holes would inevitably lead to uneven distribution of electrolyte in different areas of the core 220, thus affecting the injection effect. Designing the diameter of the first through-hole 110 to be larger than that of the second through-hole 120 makes it easier for the electrolyte flow rate through the first through-hole 110 to be greater than that through the second through-hole 120.

[0042] By rationally controlling the electrolyte flow rate of the two through-holes, the larger area of ​​the core 220 can receive a sufficient amount of electrolyte, while the smaller area can also receive an appropriate amount of electrolyte, thus ensuring the uniformity of electrolyte contact and wetting at all locations of the core 220. This uniform wetting effect is one of the key factors in ensuring the quality of electrolyte injection into the cell 200. Only when all locations of the core 220 are sufficiently and uniformly wetted with electrolyte can the quality of electrolyte injection into the cell 200 by the injection needle designed in this embodiment be ensured, thereby improving the overall performance and consistency of the battery.

[0043] In some specific embodiments, the ratio of the opening area of ​​the first liquid passage 110 to the second liquid passage 120 is equal to the ratio of the length of the long side 212 to the length of the wide side 211 of the housing 210. In the actual cell 200 structure, the required amount of electrolyte in the core 220 area corresponding to the long side 212 and the wide side 211 of the housing 210 varies due to the different areas.

[0044] By setting the ratio of the opening areas of the first liquid passage 110 to the second liquid passage 120 to be equal to the ratio of the length of the long surface 212 to the length of the wide surface 211 of the housing 210, the ratio of the amount of electrolyte passing through the first liquid passage 110 and the second liquid passage 120 can be further precisely controlled. This is because the opening area of ​​the liquid passage directly affects the amount of electrolyte passing through; the larger the area, the more electrolyte passes through in the same amount of time.

[0045] When the electrolyte flow rate is designed according to this ratio, the flow rate of the electrolyte can be rationally allocated based on the actual needs of the areas of the core 220 corresponding to the long surface 212 and the wide surface 211 of the housing 210. This ensures that all positions of the core 220 receive an appropriate amount of electrolyte during the electrolyte injection process, further ensuring the uniformity of wetting of the core 220 and improving the quality and consistency of electrolyte injection into the core 200.

[0046] In some specific embodiments, at least two of the first liquid passage hole 110 and the second liquid passage hole 120 are provided along the axial direction of the needle body 100, which facilitates dividing the electrolyte falling in the same direction into multiple projectile trajectories, thereby further improving the uniformity of wetting of the core 220.

[0047] In some specific embodiments, the upper end of the needle body 100 is provided with a locking post 300, which is used to lock onto the injection device. The side wall of the locking post 300 is symmetrically provided with two anti-slip protrusions 310 relative to the axis of the needle body 100. The anti-slip protrusions 310 are specifically elastic elements. The anti-slip protrusions 310 are used to limit the installation with the mounting part of the injection device, so as to facilitate the fastening of the locking post 300 and the injection device and improve the safety of use in this embodiment.

[0048] In some specific embodiments, the anti-slip protrusion 310 has a semi-circular cross-section, and the axis of the anti-slip protrusion 310 intersects the axis of the first liquid passage 110 in the same plane. This facilitates the operator in quickly distinguishing the installation direction of the needle body 100 when installing and using this embodiment, thereby improving the installation and use efficiency of this embodiment.

[0049] In some specific embodiments, the end of the snap-fit ​​post 300 opposite to the needle body 100 is equipped with an infusion tubing 400. The two ends of the infusion tubing 400 are respectively connected to the infusion tube of the infusion device and the needle body 100, so that the needle body 100 can maintain constant communication with the infusion tube of the infusion device when the position of the needle body 100 is finely adjusted.

[0050] In some specific embodiments, the infusion hose 400 is a corrugated hose. Compared with ordinary straight hoses, corrugated hoses have unique advantages. Its outer wall presents a series of continuous annular corrugations. This special structure gives it better performance in terms of bending, expansion and contraction and pressure resistance. It can better adapt to various complex working conditions in the actual operation of the injection equipment and ensure the stability and reliability of electrolyte delivery.

[0051] This utility model also provides a liquid injection device, specifically a square battery liquid injection machine, which is mainly used for liquid injection processing of rectangular-shaped battery cells 200. It includes the square battery cell liquid injection needle described in Embodiment 1. The square battery cell liquid injection needle is installed on the liquid injection device, and the liquid injection device has all the beneficial effects of the square battery cell liquid injection needle, which will not be described in detail here.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A square battery cell injection needle, installed on an injection device, characterized in that, include: The needle body (100) is vertically disposed above the opening on the housing (210) of the battery cell (200). The upper end of the needle body (100) is connected to the injection tube of the injection device. A first liquid passage hole (110) and a second liquid passage hole (120) are respectively opened on the side wall of the needle body (100). The axis of the first liquid passage hole (110) is perpendicular to the wide surface (211) of the housing (210), and the axis of the second liquid passage hole (120) is perpendicular to the long surface (212) of the housing (210).

2. The square battery cell injection needle according to claim 1, characterized in that, The first liquid passage (110) and the second liquid passage (120) are respectively symmetrically arranged with respect to the axis of the needle body (100).

3. The square battery cell injection needle according to claim 2, characterized in that, The diameter of the first liquid passage (110) is larger than the diameter of the second liquid passage (120).

4. The square battery cell injection needle according to claim 3, characterized in that, The ratio of the opening area of ​​the first liquid passage (110) to the second liquid passage (120) is equal to the ratio of the length of the long side (212) to the length of the wide side (211) of the housing (210).

5. The square battery cell injection needle according to claim 2, characterized in that, At least two of the first liquid passage hole (110) and the second liquid passage hole (120) are provided along the axial direction of the needle body (100).

6. The square battery cell injection needle according to claim 1, characterized in that, The upper end of the needle body (100) is provided with a snap-fit ​​post (300), which is used to snap-fit ​​and install on the liquid injection device. Two anti-slip protrusions (310) are provided symmetrically on the side wall of the snap-fit ​​post (300) relative to the axis of the needle body (100). The anti-slip protrusions (310) are used to limit the installation with the installation part of the liquid injection device.

7. The square battery cell injection needle according to claim 6, characterized in that, The anti-slip ridge (310) has a semi-circular cross section, and the axis of the anti-slip ridge (310) intersects the axis of the first liquid passage hole (110) in the same plane.

8. The square battery cell injection needle according to claim 6, characterized in that, The end of the snap-fit ​​post (300) opposite to the needle body (100) is equipped with an infusion tubing (400), and the two ends of the infusion tubing (400) are respectively connected to the infusion tube of the infusion device and the needle body (100).

9. The square battery cell injection needle according to claim 8, characterized in that, The infusion tubing (400) is a corrugated tube.

10. A liquid injection device, characterized in that, Includes the square cell injection needle as described in any one of claims 1 to 9.

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