Liquid injection equipment

Abstract

The embodiment of the utility model provides liquid injection equipment. The liquid injection equipment comprises a liquid injection assembly and a positioning assembly. Wherein the liquid injection assembly comprises a liquid injection needle, the positioning assembly comprises a platform, the platform is provided with a fixing part, the fixing part is used for fixing a battery cell, the surface, facing the liquid injection needle, of the platform is further provided with an electrolyte collection hole, and the electrolyte collection hole is filled with an adsorption part; and after at least one time of liquid injection, the liquid injection needle extends into the electrolyte collection hole, and the electrolyte on the liquid injection needle is removed by utilizing the adsorption piece. The liquid injection needle is cleaned by using the adsorption part, so that the electrolyte is prevented from forming crystals on the liquid injection needle, and the electrolyte is prevented from continuously polluting the liquid injection hole of the battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery, in particular to a liquid injection device. BACKGROUND

[0002] With the rapid development of economy and technology, the application of batteries is becoming more and more extensive. Among them, lithium ion batteries have the advantages of high packaging reliability, high system energy efficiency, high energy density, simple structure, long cycle life and relatively good stability, and have been widely used in many fields. Whether it is energy storage, mobile devices or the automotive industry, it plays an irreplaceable role.

[0003] The production process of the battery includes a liquid injection process, which refers to injecting a specified type and capacity of electrolyte into the battery. The quality of the liquid injection process has a huge impact on the performance, appearance and other aspects of the battery. In the actual liquid injection process production process, the battery is automatically injected, the robot places the battery cell on the positioned clamp, and the liquid injection device automatically pumps the vacuum to achieve negative pressure injection.

[0004] However, the electrolyte in the above liquid injection process is easy to contaminate the liquid injection hole of the battery cell. Utility model content

[0005] The embodiment of the present application provides a liquid injection device for reducing the contamination of the electrolyte to the liquid injection hole of the battery cell.

[0006] The embodiment of the present application provides a liquid injection device for injecting liquid into a battery cell, comprising: a liquid injection assembly and a positioning assembly;

[0007] The liquid injection assembly comprises a liquid injection needle, and the positioning assembly comprises a platform, the platform has a fixing part for fixing the battery cell, and the surface of the platform facing the liquid injection needle is further provided with an electrolyte collection hole, and the electrolyte collection hole is filled with a suction accessory;

[0008] After at least one liquid injection, the liquid injection needle is inserted into the electrolyte collection hole, and the electrolyte on the liquid injection needle is removed by the suction accessory.

[0009] In some possible implementations, the platform comprises a first support, the side surface of the first support is provided with the fixing part, and the top surface of the first support is provided with the electrolyte collection hole.

[0010] In some possible implementations, the first support comprises a first plate and a second plate arranged opposite to each other, and a third plate connected between the first plate and the second plate;

[0011] The third plate is provided with the electrolyte collection hole and the fixing part.

[0012] In some possible embodiments, the first plate member, the second plate member and the fixing portion are arranged on the same side of the third plate member.

[0013] In some possible embodiments, the fixing portion is formed with a positioning opening on a surface thereof facing away from the third plate member, and the positioning opening is clamped on two surfaces of the battery cell opposite in the thickness direction.

[0014] In some possible embodiments, the positioning assembly further comprises a first driving mechanism, and the platform is fixed to the battery cell under the driving of the first driving mechanism.

[0015] In some possible embodiments, the first driving mechanism is provided in two, and the two first driving mechanisms are arranged at intervals and are respectively connected to two ends of the platform.

[0016] In some possible embodiments, the first driving mechanism comprises a first driving member, a support member and a second driving member.

[0017] The output end of the first driving member is fixedly connected to the support member, and the support member is driven to move in a first direction.

[0018] The second driving member is fixedly connected to the support member, and the output end of the second driving member is fixedly connected to the platform, and the platform is driven to move in a second direction, and the second direction is transverse to the first direction.

[0019] In some possible embodiments, the second driving member and the platform are arranged on the top surface of the support member, and the top surface of the support member is further provided with a sliding rail for the movement of the platform.

[0020] In some possible embodiments, the platform is further provided with an electrolyte collection channel in communication with the electrolyte collection hole, and the electrolyte collection channel is connected to a first vacuum pump.

[0021] In some possible embodiments, the suction member comprises at least one of a sponge and a non-woven fabric.

[0022] In some possible embodiments, the liquid injection assembly further comprises a second support and a second driving mechanism.

[0023] The second driving mechanism is in transmission connection with the second support, and drives the second support to move close to or away from the platform, and the second support is connected to the liquid injection needle.

[0024] In some possible embodiments, the second support includes a first flat plate and a second flat plate arranged oppositely, and a connecting rod connecting the first flat plate and the second flat plate, the second flat plate being located on a side of the first flat plate away from the platform;

[0025] The liquid injection needle is arranged between the first flat plate and the second flat plate and extends to a side of the first flat plate away from the second flat plate.

[0026] In some possible embodiments, the liquid injection needle includes a main body, a head arranged at one end of the main body, and a sealing nozzle sleeved outside the head;

[0027] The main body and the head are provided with fluid channels, and the head is made of a fluorine rubber material.

[0028] In some possible embodiments, the head extends 3-5 mm outside the sealing nozzle.

[0029] The liquid injection device in the embodiments of the present application is used for injecting liquid into an electric core and includes a liquid injection assembly and a positioning assembly. The liquid injection assembly includes a liquid injection needle, and the positioning assembly includes a platform having a fixing portion for fixing the electric core. The surface of the platform facing the liquid injection needle is further provided with an electrolyte collecting hole, and the electrolyte collecting hole is filled with a suction accessory. After at least one time of liquid injection, the liquid injection needle extends into the electrolyte collecting hole, and the electrolyte on the liquid injection needle is removed by using the suction accessory. The liquid injection needle is cleaned by using the suction accessory, so that the electrolyte cannot form crystals on the liquid injection needle, thereby preventing the electrolyte from continuously polluting the liquid injection hole of the electric core. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] Figure 1 FIG. 1 is a perspective view of a liquid injection device in an embodiment of the present application;

[0032] Figure 2 FIG. 2 is a front view of the liquid injection device in the embodiment of the present application;

[0033] Figure 3 FIG. 3 is a side view of the liquid injection device in the embodiment of the present application;

[0034] Figure 4 FIG. 4 is a top view of the liquid injection device in the embodiment of the present application;

[0035] Figure 5 FIG. 5 is a top view of a liquid injection needle in the embodiment of the present application;

[0036] Figure 6This is a cross-sectional view of the injection needle in an embodiment of this application;

[0037] Figure 7 This is a top view of the injection needle in an embodiment of this application;

[0038] Figure 8 This is a perspective view of the positioning component in the embodiments of this application;

[0039] Figure 9 This is a front view of the positioning component in an embodiment of this application;

[0040] Figure 10 This is a side view of the positioning component in an embodiment of this application;

[0041] Figure 11 This is a top view of the positioning component in an embodiment of this application;

[0042] Figure 12 This is a front view of the injection assembly in an embodiment of this application;

[0043] Figure 13 This is a side view of the injection assembly in an embodiment of this application;

[0044] Figure 14 This is a top view of the injection assembly in an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10-Injection assembly;

[0047] 20 - Injection needle; 21 - Main body; 22 - Head; 23 - Sealing nozzle; 24 - Fluid channel;

[0048] 30 - Second support; 31 - First plate; 32 - Second plate; 33 - Connecting rod; 34 - Second vacuuming component;

[0049] 40 - Second drive mechanism;

[0050] 50 - Positioning component;

[0051] 60 - Platform; 61 - First plate; 62 - Second plate; 63 - Third plate; 64 - Fixing part; 65 - Positioning port; 66 - Electrolyte collection hole; 67 - Electrolyte collection channel;

[0052] 70-First driving mechanism; 71-First driving component; 72-Supporting component; 73-Second driving component. Detailed Implementation

[0053] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0054] The injection needle of the injection device consists of a head and a rubber nozzle wrapped around the head. After prolonged injection, electrolyte crystals can easily remain around the rubber nozzle, thus contaminating the injection port of the battery cell. In addition, the head is usually made of metal (such as stainless steel), which can easily interfere with the injection port during injection, damaging the injection port and introducing metal impurities.

[0055] Therefore, this application provides a liquid injection device that uses an adsorption element in the electrolyte collection hole to adsorb and clean the residual electrolyte on the surface of the injection needle. This can prevent electrolyte residue on the surface of the injection needle and ensure cleanliness, thereby preventing the injection needle from contaminating the battery cell.

[0056] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] Please refer to Figures 1 to 14 This application provides a liquid injection device for battery liquid injection, which injects electrolyte into the battery cell. The liquid injection device can be a negative pressure liquid injection machine, and the battery can be a blade battery, specifically a rectangular aluminum-cased lithium-ion battery.

[0058] A battery includes at least one cell, or multiple cells, to improve voltage, capacity, and other parameters to meet different energy demands. A cell includes a casing, and within the casing are a positive electrode, a negative electrode, a separator, and an electrolyte. Metal ions in the electrolyte move between the positive and negative electrodes to function. The casing has an injection port through which the electrolyte is injected. The casing, positive electrode, negative electrode, and separator can utilize existing structures, and the electrolyte can use existing solutions; these will not be elaborated further here.

[0059] Continue reading Figures 1 to 14The electrolyte injection device includes an injection assembly 10 and a positioning assembly 50. The injection assembly 10 extends into the injection port of the battery cell to inject electrolyte into the cell. The injection assembly 10 includes an injection needle 20, one end of which extends into the injection port of the battery cell. A fluid channel 24 inside the injection needle 20 is used to evacuate the battery cell and inject electrolyte into its interior. Figure 1 and Figure 2 As shown, multiple injection needles 20 are provided, and the multiple injection needles 20 are arranged in parallel to inject liquid into multiple cells at the same time, thereby improving the injection efficiency.

[0060] See Figures 5 to 7 The injection needle 20 includes: a main body 21, a head 22 disposed at one end of the main body 21, and a sealing nozzle 23 sleeved over the head 22; a fluid channel 24 is provided inside the main body 21 and the head 22, and the head 22 is made of fluororubber material. The main body 21 is rod-shaped, and the head 22 is disposed at one end of the main body 21, such as... Figure 4 As shown, the head 22 is located at the left end of the main body 21. The outer circumference of the head 22 is smaller than that of the main body 21, so that the head 22 is smaller and can be easily inserted into the electrolyte injection hole of the battery cell. The main body 21 is larger, which can ensure that the flow rate of air during vacuuming and electrolyte during electrolyte injection is larger.

[0061] The head 22 can be made of fluororubber, giving it flexibility. During liquid injection, if interference occurs when the head 22 is inserted into the injection port of the battery cell, it can bend, preventing damage to the injection port. The body 21 can be made of a metal, such as stainless steel, to maintain rigidity and hardness, preventing deformation. The fluid channel 24 passes through the body 21 and the head 22, meaning it passes through both ends of the injection needle 20 along its length.

[0062] A sealing nozzle 23, made of an elastic material such as rubber, surrounds the outer periphery of the head 22. The sealing nozzle 23 protects the head 22 and forms a seal with the electrolyte injection port of the battery cell during electrolyte injection, thereby achieving a vacuum inside the battery cell and enabling negative pressure electrolyte injection. It also prevents electrolyte overflow during the injection process, improving the accuracy of the electrolyte injection volume. Simultaneously, the sealing nozzle 23 also forms a seal with the electrolyte collection port 66 during cleaning, enabling a vacuum in the electrolyte collection port 66 and timely discharge of the collected electrolyte.

[0063] In some possible examples, such as Figure 5As shown, the head 22 extends beyond the sealing nozzle 23 by 3mm-5mm, for example, 3mm, to facilitate insertion of the head 22 into the injection hole and to allow for bending. After one injection, electrolyte residue remains on the surface of the injection needle 20. Specifically, electrolyte residue remains on the exposed surface of the head 22 and on the surface of the sealing nozzle 23 away from the main body 21.

[0064] Continue reading Figures 1 to 4 The positioning component 50 is used to fix the battery cell. For example, the positioning component 50 snaps into the battery cell, and after fixing the battery cell, the positioning component 50 stabilizes the battery cell in the corresponding position, ensuring the alignment of the battery cell with the electrolyte injection component 10. The positioning component 50 includes a platform 60, which has a fixing part 64 for fixing the battery cell. The surface of the platform 60 facing the electrolyte injection needle 20 is also provided with an electrolyte collection hole 66, which is filled with an absorbent. After at least one injection, the electrolyte injection needle 20 extends into the electrolyte collection hole 66, and the absorbent removes the electrolyte from the electrolyte injection needle 20.

[0065] The platform 60 can be located below the injection needle 20, and the top surface of the platform 60 is provided with an electrolyte collection hole 66. The shape of the electrolyte collection hole 66 is adapted to the shape of the injection needle 20, for example, both are circular. The number of electrolyte collection holes 66 is greater than or equal to the number of injection needles 20, for example, equal, so that each injection needle 20 can be cleaned after injection to remove residual electrolyte from the injection needle 20.

[0066] An absorbent element is filled inside the electrolyte collection hole 66. This element cleans the injection needle 20, ensuring that electrolyte does not crystallize on it, thus preventing continuous contamination of the battery cell's injection hole. The platform 60, in conjunction with other structures, can also replace manual wiping of the injection needle 20, achieving automation. In some possible examples, the absorbent element can be at least one of non-woven fabric and sponge, which can thoroughly absorb the electrolyte on the surface of the injection needle 20, providing a good cleaning effect. The absorbent element can also be other materials with adsorption properties; this embodiment is not limited to these.

[0067] In some possible implementations, see [reference] Figures 8 to 11The platform 60 also includes an electrolyte collection channel 67, which is connected to an electrolyte collection hole 66 and also to a first vacuum pumping component. The electrolyte collection channel 67 can be located on the side wall or bottom wall of the electrolyte collection hole 66. When the injection needle 20 is inserted into the electrolyte collection hole 66, a seal is formed between it and the hole. This seal between the electrolyte collection hole 66 and the injection needle 20 allows the first vacuum pumping component to remove the electrolyte adsorbed by the adsorbent within the electrolyte collection hole 66 through vacuuming.

[0068] See Figure 8 The platform 60 includes a first support, a fixing part 64 is provided on the side of the first support, and an electrolyte collection hole 66 is provided on the top surface of the first support. In this way, the first support is located below the injection needle 20, and the fixing part 64 is located beside the injection needle 20, which can improve space utilization and also facilitate the alignment of the fixing part 64 and the electrolyte collection hole 66.

[0069] Specifically, the first support includes a first plate 61 and a second plate 62 arranged opposite to each other, and a third plate 63 connected between the first plate 61 and the second plate 62. The third plate 63 is provided with an electrolyte collection hole 66 and a fixing part 64. The first plate 61, the second plate 62 and the third plate 63 can be an integral structure. The top surfaces of the first plate 61, the second plate 62 and the third plate 63 are flush, which facilitates the placement and connection of the first support.

[0070] The first plate 61 and the second plate 62 are located at both ends of the third plate 63, respectively. For example, the first plate 61, the second plate 62 and the third plate 63 can be U-shaped or I-shaped to form a receiving space between them, which can accommodate the battery cell, facilitate the cooperation between the battery cell and the fixing part 64, and achieve accurate positioning of the battery cell.

[0071] The top surface of the third plate 63 is provided with an electrolyte collection hole 66, and the side surface of the third plate 63 is provided with a fixing part 64. The third plate 63 is used to fix and position the battery cell. The battery cell is placed on a pre-positioned clamp, for example, the clamp is fixed to the bottom of the battery cell. The third plate 63 moves to the front of the battery cell and then retracts to fix it to the top of the battery cell, ensuring that the electrolyte injection hole of the battery cell is aligned with the electrolyte injection needle 20.

[0072] In some possible examples, the first plate 61, the second plate 62, and the fixing part 64 are disposed on the same side of the third plate 63. For example... Figure 4 As shown, the first plate 61, the second plate 62, and the fixing part 64 are all located on the rear side of the third plate 63. This reduces the impact on the first bracket along the front-rear direction. Figure 1The dimensions shown in the Y direction improve space utilization.

[0073] The fixing part 64 can be a rectangular body. The top surface of the fixing part 64 is aligned with the top surface of the third plate 63, and the bottom surface of the fixing part 64 is aligned with the bottom surface of the third plate 63 to increase the contact area between the fixing part 64 and the battery cell. A positioning hole 65 is formed on the surface of the fixing part 64 opposite to the third plate 63. The positioning hole 65 is engaged with two opposing surfaces of the battery cell along the thickness direction.

[0074] With this configuration, the fixing part 64 faces the narrow side of the battery cell and engages with the large side of the battery cell, allowing more battery cells to be arranged within the first bracket and improving the electrolyte injection efficiency. The surface of the battery cell includes two large sides, two narrow sides, and two end faces arranged opposite each other. The large side is the largest surface of the battery cell; the narrow sides are connected to the long side of the large side; and the end faces are connected to the short side of the large side, with electrolyte injection holes provided on the end faces.

[0075] Continue reading Figure 1 , Figures 8 to 11 The positioning component 50 also includes a first drive mechanism 70, which is connected to the platform 60 via a transmission connection. The platform 60 fixes the battery cell under the drive of the first drive mechanism 70. The first drive mechanism 70 can be used to move the platform 60, specifically to move the platform 60 along a first direction and along a second direction, thereby enabling the fixing part 64 to fix the battery cell to align with the injection needle 20, or to align the electrolyte collection hole 66 with the injection needle 20.

[0076] The first direction intersects with the second direction, for example, they are perpendicular. The first direction is the vertical direction, such as... Figure 1 The Z direction is shown. The second direction is the forward / backward direction, as shown... Figure 1 The Y direction is shown. The first drive mechanism 70 can make the platform 60 move up and down and back and forth. In this way, the platform 60 can move downward and retract backward, thereby fixing the top of the battery cell.

[0077] In some possible implementations, two first drive mechanisms 70 are provided, spaced apart, and respectively connected to both ends of the platform 60. Each end of the platform 60 is provided with a corresponding first drive mechanism 70, enabling synchronous movement of both ends of the platform 60, ensuring smooth movement of the platform 60 and preventing tilting, jamming, or other abnormalities.

[0078] In an example where platform 60 includes a first support, and the first support includes a first plate 61, a second plate 62, and a third plate 63, one of the two first drive mechanisms 70 is connected to one end of the first plate 61, and the other of the two first drive mechanisms 70 is connected to one end of the second plate 62. For example, the two first drive mechanisms 70 are respectively connected to the ends of the first plate 61 and the second plate 62 opposite to the third plate 63.

[0079] In some possible implementations, the first drive mechanism 70 includes: a first drive member 71, a support member 72, and a second drive member 73; the output end of the first drive member 71 is fixedly connected to the support member 72, driving the support member 72 to move along a first direction; the second drive member 73 is fixedly connected to the support member 72, and the output end of the second drive member 73 is fixedly connected to the platform 60, driving the platform 60 to move along a second direction, which intersects with the first direction.

[0080] Specifically, the first driving member 71 causes the support member 72 to move along a first direction, such as up and down, thereby driving the platform 60 to move along the first direction. The support member 72 provides support for at least the second driving member 73, which is directly connected to the platform 60, causing the platform 60 to move along a second direction, such as back and forth, providing the platform 60 with at least two degrees of freedom of movement, so that the platform 60 can move into place and thus fix the battery cell.

[0081] The first driving component 71 can be a cylinder, for example, that moves up and down, and the position of its output end is fixed. The support component 72 can be a plate, which is mounted on the output end of the first driving component 71, supporting the support component 72 and moving synchronously with it. The second support component 72 can be a servo motor, for example, that moves back and forth.

[0082] In some examples, both the first drive member 71 and the platform 60 are disposed on the top surface of the support member 72, and the top surface of the support member 72 is also provided with a slide rail for the platform 60 to move. For example... Figure 8 and Figure 10 As shown, the first driving member 71, the support member 72, and the second driving member 73 are stacked, and the first driving mechanism 70 has good stability. The platform 60 is mounted on the support member 72 to facilitate connection with the second driving member 73. Furthermore, the support member 72 is also provided with a slide rail for the platform 60 to move, guiding the platform 60 and ensuring its stability and accuracy, facilitating the alignment of the fixing part 64 and the battery cell. For example, the bottom surface of the platform 60 is provided with a corresponding groove to cooperate with the slide rail. In other examples, the bottom surface of the platform 60 is provided with a slide rail, and the top surface of the support member 72 is provided with a corresponding groove.

[0083] See Figure 1 ,Figures 11 to 14 The electrolyte injection assembly 10 also includes a second support 30 and a second drive mechanism 40. The second drive mechanism 40 is connected to the second support 30 and drives the second support 30 to move closer to or away from the platform 60. The second support 30 is fixedly connected to and sealed with the electrolyte injection needle 20. The second support 30 is used to mount the electrolyte injection needle 20 and is connected to the second drive mechanism 40. The second drive mechanism 40 can drive the second support 30 to move closer to or away from the platform 60, thereby enabling the electrolyte injection into the cell and cleaning of the electrolyte injection needle 20. The second support 30 is also sealed to the electrolyte injection needle 20, for example, by setting a sealing ring, which can achieve vacuuming inside the cell and prevent electrolyte leakage.

[0084] In some possible examples, the second support 30 includes a first plate 31 and a second plate 32 disposed opposite to each other, and a connecting rod 33 connecting the first plate 31 and the second plate 32, the second plate 32 being located on the side of the first plate 31 away from the platform 60; the injection needle 20 is disposed between the first plate 31 and the second plate 32 and extends to the side of the first plate 31 away from the second plate 32.

[0085] The first plate 31 and the second plate 32 are arranged opposite each other along a first direction, with the second plate 32 specifically located above the first plate 31. The injection needle 20 is positioned between the first plate 31 and the second plate 32, so that the second plate 32 supports the top of the injection needle 20 and the first plate 31 supports the bottom of the injection needle 20, ensuring that the injection needle 20 is vertical. The bottom of the injection needle 20 refers to the area near its head 22. A second vacuuming component 34 can also be provided on the surface of the second plate 32 facing away from the first plate 31. The second vacuuming component 34 is connected to the injection needle 20 to achieve vacuuming inside the battery cell.

[0086] The injection needle 20 extends outward from the side of the first plate 31 opposite to the second plate 32, protruding relative to the first plate 31 to insert into the injection hole or electrolyte collection hole 66 of the battery cell. Both the first plate 31 and the second plate 32 are provided with through holes, through which the injection needle 20 passes and seals with the through hole of the second plate 32. The connecting rod 33 is disposed between the first plate 31 and the second plate 32 and connects to both plates, for example, via a threaded connection.

[0087] The second drive mechanism 40 is connected to the second plate 32 and is located on the same side of the second plate 32 as the first plate 31, such as... Figure 2As shown, a second drive mechanism 40 is connected to the bottom surface of the second plate 32, and a first plate 31 is disposed below the second plate 32 to make the structure of the second drive mechanism 40 and the second support 30 more compact. The second drive mechanism 40 includes a servo motor, the output end of which is fixedly connected to the second plate 32. Using the servo motor, the injection needle 20 can be precisely controlled to descend and accurately position itself.

[0088] The working process of the liquid injection device in this application embodiment specifically includes a liquid injection process and a cleaning process. The liquid injection process and the cleaning process can be performed alternately, or the cleaning process can be performed after two or more liquid injection processes are completed.

[0089] The liquid injection process is as follows: The first driving component 71 controls the platform 60 to descend, the fixing part 64 corresponds to the narrow face of the battery cell, the second driving component 73 moves inward, and the fixing part 64 clamps the battery cell. The second driving mechanism 40 controls the injection needle 20 to descend, extending into the injection hole of the battery cell to evacuate the battery cell, and then inject liquid after evacuation. After liquid injection is completed, the second driving mechanism 40 controls the injection needle 20 to rise, the second driving component 73 moves outward, away from the battery cell, the first driving component 71 lifts the platform 60, the platform 60 and the injection needle 20 reset, and the battery cell can be removed.

[0090] Cleaning process: The first drive component 71 controls the platform 60 to descend, and the second drive component 73 moves inward, bringing the platform 60 directly below the injection needle 20. The second drive mechanism 40 controls the injection needle 20 to descend, extending into the electrolyte collection hole 66 of the platform 60. The adsorption component thoroughly adsorbs the electrolyte on the surface of the injection needle 20. The electrolyte collection hole 66 connects to the electrolyte collection channel 67, and the adsorbed electrolyte is discharged through a vacuum pump via the electrolyte collection channel 67. The second drive mechanism 40 controls the injection needle 20 to rise, the second drive component 73 moves outward, and the first drive component 71 lifts the platform 60, resetting the platform 60 and the injection needle 20.

[0091] The electrolyte injection device in this embodiment is used for injecting electrolyte into a battery cell, and includes an injection assembly 10 and a positioning assembly 50. The injection assembly 10 includes an injection needle 20, and the positioning assembly 50 includes a platform 60. The platform 60 has a fixing part 64 for fixing the battery cell. An electrolyte collection hole 66 is also provided on the surface of the platform 60 facing the injection needle 20, and the electrolyte collection hole 66 is filled with an absorbent. After at least one injection, the injection needle 20 extends into the electrolyte collection hole 66, and the absorbent removes the electrolyte from the injection needle 20. The absorbent cleans the injection needle 20, ensuring that the electrolyte does not crystallize on the injection needle 20, thus preventing continuous contamination of the battery cell's injection hole by the electrolyte.

[0092] The embodiments or implementation methods described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. 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 can be combined in any suitable manner in one or more embodiments or examples.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid injection apparatus characterized by comprising: The application discloses a liquid injection device for an electric cell, which comprises a liquid injection assembly (10) and a positioning assembly (50). The liquid injection assembly (10) comprises a liquid injection needle (20), and the positioning assembly (50) comprises a platform (60) provided with a fixing portion (64) for fixing the electric cell, and a surface of the platform (60) facing the liquid injection needle (20) is further provided with an electrolyte collecting hole (66) filled with a suction accessory. After at least one time of liquid injection, the liquid injection needle (20) is inserted into the electrolyte collecting hole (66) to remove the electrolyte on the liquid injection needle (20) by the suction accessory.

2. The liquid injection apparatus according to claim 1, wherein The platform (60) comprises a first support provided with the fixing portion (64) on a side surface and provided with the electrolyte collecting hole (66) on a top surface.

3. The liquid injection apparatus according to claim 2, wherein The first support comprises a first plate (61) and a second plate (62) oppositely arranged, and a third plate (63) connected between the first plate (61) and the second plate (62). The third plate (63) is provided with the electrolyte collecting hole (66) and the fixing portion (64).

4. The liquid injection apparatus according to claim 3, wherein The first plate (61), the second plate (62) and the fixing portion (64) are arranged on the same side of the third plate (63).

5. The liquid injection apparatus according to claim 3, wherein A positioning opening (65) is formed on a surface of the fixing portion (64) away from the third plate (63), and the positioning opening (65) is clamped on two surfaces of the electric cell opposite in the thickness direction.

6. The liquid infusing device of any one of claims 1-5, wherein, The positioning assembly (50) further comprises a first driving mechanism (70) in driving connection with the platform (60), and the platform (60) fixes the electric cell under the driving of the first driving mechanism (70).

7. The liquid injection apparatus according to claim 6, wherein The first driving mechanism (70) is provided with two first driving mechanisms (70) arranged at intervals and connected with two ends of the platform (60) respectively.

8. The liquid injection apparatus according to claim 6, wherein The first driving mechanism (70) comprises a first driving member (71), a supporting member (72) and a second driving member (73). An output end of the first driving member (71) is fixedly connected with the supporting member (72) to drive the supporting member (72) to move in a first direction. The second driving member (73) is fixedly connected with the supporting member (72), and an output end of the second driving member (73) is fixedly connected with the platform (60) to drive the platform (60) to move in a second direction intersecting with the first direction.

9. The liquid injection apparatus according to claim 8, wherein The second driving member (73) and the platform (60) are arranged on a top surface of the supporting member (72), and the top surface of the supporting member (72) is further provided with a sliding rail for the movement of the platform (60).

10. The liquid infusing device of any one of claims 1-5, wherein, The platform (60) is further provided with an electrolyte collecting channel (67) in communication with the electrolyte collecting hole (66), and the electrolyte collecting channel (67) is connected with a first vacuum pump.

11. The liquid infusing device of any one of claims 1-5, wherein, The suction accessory comprises at least one of sponge and non-woven fabric.

12. The liquid infusing device of any one of claims 1-5, wherein, The liquid injection assembly (10) further comprises a second support (30) and a second driving mechanism (40); The second driving mechanism (40) is in transmission connection with the second support (30) and drives the second support (30) to move close to or away from the platform (60), and the second support (30) is connected with the liquid injection needle (20).

13. The liquid injection apparatus according to claim 12, wherein The second support (30) comprises oppositely arranged first and second plates (31 and 32) and a connecting rod (33) connecting the first and second plates (31 and 32), and the second plate (32) is located on the side of the first plate (31) away from the platform (60). The liquid injection needle (20) is arranged between the first and second plates (31 and 32) and extends to the side of the first plate (31) away from the second plate (32).

14. The liquid infusing device of any one of claims 1-5, wherein, The liquid injection needle (20) comprises a main body (21), a head (22) arranged at one end of the main body (21), and a sealing nozzle (23) sleeved outside the head (22). Fluid channels (24) are arranged in the main body (21) and the head (22), and the material of the head (22) is fluorine glue material.

15. The liquid injection apparatus according to claim 14, wherein The head (22) extends 3-5 mm outside the sealing nozzle (23).

Images