Liquid injection device for lithium battery production

Abstract

The utility model discloses a liquid injection device for lithium battery production, which relates to the technical field of battery production, and comprises a battery shell, a liquid conveying component and a quantitative liquid injection component, and an input end is communicated with the liquid conveying component; the controller is electrically connected with the quantitative liquid injection assembly; the quantitative liquid injection assembly comprises a weighing tank, a liquid injection pipe is installed at the bottom end of the weighing tank, a second flow meter and a second valve are installed on the liquid injection pipe, and the second flow meter and the second valve are both electrically connected with the controller. The liquid injection flow and time are controlled through the quantitative liquid injection assembly, the liquid injection volume is accurately controlled, and the liquid injection device is more suitable for liquid injection of a high-capacity battery while the time is saved in cooperation with the buffering function of the weighing tank; the positioning driving assembly is arranged, multiple sets of batteries serve as a material receiving station, time is saved, the efficiency of streamlined operation is improved, the batteries on the same material receiving station are synchronously fed and discharged in cooperation with the feeding assembly and the material pushing assembly, time is further saved, and efficiency is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery production technology, and specifically relates to a liquid injection device for lithium battery production. Background Technology

[0002] A lithium battery is a type of battery that uses lithium metal or lithium alloy as electrode material and a non-aqueous electrolyte solution. Due to the extremely reactive chemical properties of lithium metal, its processing, storage, and use require extremely stringent environmental conditions. During the production of lithium batteries, an electrolyte solution needs to be injected into the battery to provide functions such as shock resistance, waterproofing, dustproofing, and enhanced insulation.

[0003] However, most current electrolyte filling devices first weigh the required amount of electrolyte for the battery before filling. This method is suitable for small-capacity batteries. When filling large-capacity batteries, the requirements for the volume of the weighing tank and the weighing equipment are high, and it takes a long time, which increases the cost. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a liquid injection device for lithium battery production, so as to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A liquid injection device for lithium battery production includes a battery casing and a liquid delivery assembly, and further includes: a quantitative liquid injection assembly with its input end connected to the liquid delivery assembly; and a controller electrically connected to the quantitative liquid injection assembly. The quantitative liquid injection assembly includes a weighing tank with a liquid injection pipe installed at the bottom of the weighing tank. A second flow meter and a second valve are installed on the liquid injection pipe, and both the second flow meter and the second valve are electrically connected to the controller.

[0007] The infusion assembly feeds electrolyte into the weighing tank. The required electrolyte volume in the battery casing is the product of the flow rate detected by the second flow meter and the injection time. The controller controls the opening and closing of the second valve to control the injection time, thereby precisely controlling the injection volume. The weighing tank also acts as a buffer, pre-buffering electrolyte for the next set of battery casings, saving time. It is suitable for injecting electrolyte into large batteries.

[0008] Preferably, an inlet pipe is installed at the top of the weighing tank, the inlet pipe is connected to the infusion assembly, a first valve is installed on the inlet pipe, and a weighing scale is installed on the weighing tank. Both the first valve and the weighing scale are electrically connected to the controller.

[0009] The inlet pipe is used to deliver electrolyte into the weighing tank. The controller monitors the value of the weighing scale to ensure that the electrolyte in the weighing tank is not overfilled. When the electrolyte in the weighing tank is full, the controller controls the first valve to close in time.

[0010] Preferably, it also includes a positioning drive component electrically connected to the controller. The positioning drive component includes at least one output end, and the weighing tanks are installed on the output end in a corresponding manner. Multiple sets of placement boxes are arranged sequentially below the weighing tanks and along the moving direction of the output end of the positioning drive component.

[0011] The positioning drive component moves at least one set of quantitative liquid injection components to inject liquid into multiple sets of battery casings. Compared with one-to-one liquid injection, the positioning drive component saves the working time of waiting for loading and unloading, and can operate in multiple stations at the same time.

[0012] Preferably, at least two sets of adjacent placement boxes constitute a receiving station, and the activity range of each set of output terminals of the positioning drive component covers at least two sets of receiving stations.

[0013] Combining multiple adjacent placement boxes into one working unit for simultaneous loading and unloading can greatly save time and costs, and can be combined with positioning drive components.

[0014] Preferably, the receiving station is also equipped with a feeding component and a pushing component for synchronous loading and unloading of multiple battery housings. The feeding component is located on one side of the placement box opening, and the pushing component is located on the side of the placement box opposite the opening. The output end of the pushing component pushes multiple battery housings out of the opening.

[0015] The feeding component is used to assist multiple sets of battery casings at the same receiving station to enter the corresponding placement box synchronously, and the pushing component is used to assist multiple sets of battery casings at the same receiving station to move out of the corresponding placement box synchronously.

[0016] Preferably, the feeding assembly includes a pusher and a pusher plate, the pusher plate is installed on the output end of the pusher, and the movable length of the output end of the pusher is not less than the width of the battery casing; during feeding, multiple sets of batteries at the receiving station abut against the pusher plate.

[0017] The feeding component provides driving force to the batteries after liquid injection, driving multiple battery groups to be completely removed from the placement box from the opening, saving manpower.

[0018] Preferably, the feeding assembly includes an inclined pad, the top of which is flush with the bottom of the box opening and the inclined surface faces upward.

[0019] The top of the inclined pad is flush with the bottom of the placement box and the inclined surface faces upward to ensure that the battery casing does not vibrate when entering the placement box and does not cause blockage during unloading.

[0020] Preferably, the inclined surface of the inclined pad is provided with multiple sets of partitions, and the adjacent partitions form placement grooves, with each placement groove corresponding to a placement box.

[0021] As the battery casing moves along the inclined plane into the placement box, a partition protects the battery casing from falling off.

[0022] Preferably, the inclined pad is rotatably mounted on the front opening side of the placement box by a coil spring, the coil spring has a tendency to retract towards the placement box, the side wall of the placement box is shorter than the width of the battery casing, and after the material is loaded, the partition is inserted between adjacent battery casings.

[0023] After the material is loaded, the coil spring drives the inclined pad to flip so that the inclined surface is parallel to the side wall of the battery casing. The partition is inserted between the adjacent battery casings to limit the position of the battery casing.

[0024] Preferably, the infusion assembly includes a storage tank, the inlet of which is equipped with a feed hopper, and a filter element is installed inside the feed hopper.

[0025] Electrolyte is added to the storage tank from the feed hopper, and the filter element filters the electrolyte entering the storage tank, removing impurities and improving battery quality.

[0026] This invention controls the injection flow rate and time through a quantitative injection component, precisely controlling the injection volume. Combined with the buffer function of the weighing tank, it saves time and is more suitable for injecting large-capacity batteries. By setting up a positioning drive component and using multiple battery groups as a single receiving station, it saves time and improves the efficiency of assembly line operations. With the help of the feeding and pushing components, batteries at the same receiving station are simultaneously loaded and unloaded, further saving time and improving efficiency.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of a liquid injection device for lithium battery production proposed in this utility model;

[0029] Figure 2 This is a top-view perspective view of a liquid injection device for lithium battery production proposed in this utility model;

[0030] Figure 3 A cross-sectional perspective view of the liquid storage assembly;

[0031] Figure 4 A three-dimensional structural diagram of the quantitative injection component and the positioning drive component;

[0032] Figure 5 This is a sectional perspective view of the material receiving station;

[0033] Figure 6 Left sectional view of the loading component at the receiving station when it is in a limited position;

[0034] Figure 7 This is a left sectional view of the material loading assembly at the receiving station.

[0035] Reference numerals: 1. Workbench; 2. Support frame; 3. Positioning and moving assembly; 31. Lead screw module; 4. Quantitative liquid injection assembly; 401. Support plate; 402. Weighing gauge; 403. Limiting plate; 404. Weighing tank; 405. Liquid level gauge; 406. Inlet pipe; 407. First valve; 408. First flow meter; 409. Injection pipe; 410. Second flow meter; 411. Second valve; 5. Placement box; 6. Delivery pipe; 7. Battery casing; 8. Storage tank; 9. Feed hopper; 10. Protective cover; 11. Filter element; 12. Delivery pump; 13. Inclined pad; 14. Partition plate; 15. Coil spring; 16. Mounting rod; 17. Pushing component; 18. Push plate. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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.

[0037] Example 1

[0038] refer to Figures 1 to 6 The liquid injection device for lithium battery production described in this embodiment includes a workbench 1, on which a liquid infusion assembly, a positioning drive assembly 3, a placement box 5, and a controller are installed.

[0039] The infusion assembly includes a storage tank 8 and a metering injection assembly 4, which is mounted on the positioning drive assembly 3 and located above the receiving assembly.

[0040] The storage tank 8 stores a large amount of electrolyte. A feed hopper 9 is installed at the top to inject electrolyte into the storage tank 8. A delivery pump 12 is installed inside to deliver the electrolyte in the storage tank 8 to the given amount injection assembly 4. The delivery pump 12 is electrically connected to the controller to control the delivery pump 12.

[0041] Preferably, a protective cover 10 is installed on the feed hopper 9, and a filter element 11 is installed inside the feed hopper 9 to filter the electrolyte injected into the storage tank 8.

[0042] The quantitative liquid injection assembly 4 includes a weighing tank 404. The top and bottom of the weighing tank 404 are respectively equipped with an inlet pipe 406 and an injection pipe 409. The inlet pipe 406 is connected to the delivery pump 12 through a delivery pipe 6. The injection pipe 409 is equipped with a second flow meter 410 and a second valve 411. Both the second flow meter 410 and the second valve 411 are electrically connected to the controller.

[0043] When the battery capacity is large, sufficient electrolyte is first injected into the weighing tank 404. This method of injecting electrolyte into the battery casing 7 is not only time-consuming, but also requires the weighing tank 404 to be large and the positioning drive component 3 to have strong force-bearing capacity, which increases additional costs. Therefore, a second flow meter 410 and a second valve 411 are installed on the injection pipe 409. Since the liquid volume is the product of the flow rate and time, the flow rate and time of the injection pipe 409 are controlled by the controller, thereby controlling the liquid volume injected into the battery casing 7. At this time, the weighing tank 404 can play a buffering role.

[0044] The weighing tank 404 is fixedly installed on the output end of the quantitative liquid injection component 3 via a support tray 401. A limit plate 403 is installed on the support tray 401, and a weighing meter 402 is installed inside the limit plate 403. The weighing meter 402 is electrically connected to the controller. The weighing tank 404 is placed on the weighing meter 402 inside the limit plate 403. A first valve 407 is installed on the liquid inlet pipe 406. The limit plate 403 ensures the stability of the weighing tank 404. The weighing meter 402 monitors the weight of the electrolyte in the weighing tank 404 in real time through the controller to prevent the weighing tank 404 from being overfilled.

[0045] Preferably, a first flow meter 408 is installed on the injection pipe 409. The first flow meter 408 is electrically connected to the controller. The controller monitors the first flow meter 408 and then controls the first valve 407 to control the liquid content in the weighing tank 404.

[0046] Preferably, the weighing tank 404 is also equipped with a liquid level gauge 405 to facilitate observation of the electrolyte level inside the weighing tank 404.

[0047] The positioning drive component 3 includes at least one output end, and each output end is equipped with a quantitative injection component 4. Multiple sets of placement boxes 5 are installed below the quantitative injection component 4. The arrangement of the multiple sets of placement boxes 5 is consistent with the moving direction of the output end of the positioning drive component 3. If the output end of the positioning drive component 3 moves in a straight line, the multiple sets of placement boxes 5 are arranged in a straight line. If the output end of the positioning drive component 3 moves in a circular reciprocating motion, the multiple sets of placement boxes 5 are arranged in a circular motion.

[0048] Preferably, the positioning drive assembly 3 includes a lead screw module 31, which is mounted on the workbench 1 via a frame 1. A slide is threaded onto the lead screw module 31, and a support tray 401 is fixedly connected to the slide. Multiple placement boxes 5 are arranged in a straight line, and the injection tube 409 injects liquid into the battery casing 7 placed in the placement box 5 in sequence under the drive of the lead screw module 31.

[0049] At least two adjacent placement boxes 5 constitute a receiving station. The range of motion of each output end of the positioning drive component 3 covers at least two receiving stations. Each receiving station is also equipped with a feeding component and a pushing component for synchronous loading and unloading of multiple battery housings 7. The feeding component is located on the side of the opening of the side wall of the placement box 5, and the pushing component is located on the side of the placement box 5 opposite to the opening. The output end of the pushing component pushes multiple battery housings 7 out of the opening.

[0050] refer to Figure 4 Preferably, three adjacent sets of placement boxes 5 constitute a receiving station. The pushing component includes a pusher 17 and a pusher plate 18. The pusher 17 is electrically connected to the controller and is a linear drive device such as a cylinder. The pusher 17 is installed on the side of the placement box 5 near the liquid storage tank 8. The pusher plate 18 simultaneously pushes three adjacent sets of batteries to move towards the front opening side of the placement box 5. The feeding component includes an inclined pad 13. The inclined pad 13 is installed on the front opening side of the placement box 5. The top of the inclined pad 13 is flush with the bottom of the opening of the placement box 5 and the inclined surface faces upward. Multiple sets of partitions 14 are provided on the inclined surface of the inclined pad 13 to prevent the batteries or battery casings 7 from falling off the inclined pad 13. Placement slots are formed between adjacent partitions 14, and the placement slots correspond one-to-one with the placement boxes 5.

[0051] During loading, workers push the three sets of battery casings 7 into their corresponding placement slots, and then push them into the placement box 5 along the placement slots. The inclined pad 13 prevents movement and reduces the burden on workers. The injection tube 409 injects liquid into the battery casings 7 one by one. When all three sets of battery casings 7 have been injected, that is, the work in one receiving station is completed, the pusher 17 is activated, and the pusher plate 18 pushes the three sets of batteries out of the placement box 5 and unloads them along the inclined pad 13. After unloading, loading can be done directly. At this time, the lead screw module 31 drives the injection tube 409 to inject liquid into the battery casings 7 of the next receiving station, saving the waiting time for loading and unloading. It can also be used in conjunction with the loading and unloading process to streamline the operation and improve efficiency.

[0052] Preferably, an installation rod 16 is installed at the front opening of the placement box 5. The two ends of the installation rod 16 are fixedly connected to the outer walls of the placement box 5 on both sides of the edge. Multiple sets of inclined pads 13 are rotatably installed on the installation rod 16 by means of coil springs 15. The coil springs 15 have a tendency to retract towards the placement box 5. The side wall of the placement box 5 is shorter than the width of the battery housing 7. After the material is loaded, the partition 14 is inserted between adjacent battery housings 7.

[0053] When loading, rotate the inclined pad 13 downward so that the inclined surface faces upward, push the battery casing 7 between the partitions 14, and then push it upward along the inclined surface until the battery casing 7 is completely inside the placement box 5. At this time, the coil spring 15 retracts and drives the inclined pad 13 to rotate upward until the partition 14 is inserted between the adjacent battery casings 7. At this time, the inclined pad 13 also acts as a limit. When unloading, rotate the inclined pad 13 downward and push the battery with the push plate 18 to complete the unloading.

[0054] This device uses a positioning drive assembly 3 and a quantitative liquid injection assembly 4 to sequentially inject liquid into the battery casing 7. This ensures accurate liquid injection while reducing equipment costs. Furthermore, multiple placement units are used for intermittent feeding and liquid injection, saving time and improving the efficiency of streamlined operations. The specific working principle is as follows:

[0055] Next set of receiving stations for electrolyte injection: The delivery pump 12 injects electrolyte into the weighing tank 404 through the delivery pipe 6 and the inlet pipe 406. The controller monitors the flow rate of the first flow meter 408 and the second flow meter 410 in real time and controls the liquid discharge time to ensure accurate liquid injection of the battery casing 7. After all batteries in a set of receiving stations are injected, the second valve 411 closes in time. The positioning drive component 3 drives the quantitative liquid injection component 4 to the first battery casing 7 of the next set of receiving stations. While the liquid injection pipe 409 moves between the two sets of battery casings 7, the inlet pipe 406 continues to inject liquid into the weighing tank 404 to reduce the waiting time of the next set of battery casings 7.

[0056] Simultaneously, the previous receiving station unloads and loads materials: the inclined pad 13 is flipped to the position with the inclined surface facing upwards, the pusher 17 drives the pusher plate 18 to push all the batteries toward the inclined pad 13 for unloading, and the batteries after liquid injection are unloaded along the inclined side. After unloading, the inclined pad 13 is kept with the inclined surface facing upwards, and multiple sets of battery housings 7 are pushed into the space between adjacent partitions 14, and then pushed upwards along the inclined surface until the battery housings 7 are respectively placed into each placement space. At this time, the coil spring 15 retracts and drives the inclined pad 13 to rotate upwards, limiting the battery housings 7 and preparing for liquid injection.

[0057] It should be understood that the terms "length", "width", "upper", "lower", "front", "left", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0058] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] 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.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A liquid injection device for lithium battery production, comprising a battery casing (7) and a liquid delivery assembly, characterized in that: Also includes: The quantitative injection component (4) has its input end connected to the infusion component; The controller is electrically connected to the quantitative injection assembly (4); The quantitative liquid injection assembly (4) includes a weighing tank (404), a liquid injection pipe (409) is installed at the bottom of the weighing tank (404), a second flow meter (410) and a second valve (411) are installed on the liquid injection pipe (409), and the second flow meter (410) and the second valve (411) are both electrically connected to the controller.

2. The electrolyte injection device for lithium battery production according to claim 1, characterized in that: The weighing tank (404) is equipped with an inlet pipe (406) at the top, which is connected to the infusion assembly. A first valve (407) is installed on the inlet pipe (406), and a weighing scale (402) is installed on the weighing tank (404). Both the first valve (407) and the weighing scale (402) are electrically connected to the controller.

3. The electrolyte injection device for lithium battery production according to claim 1, characterized in that: It also includes a positioning drive assembly (3) electrically connected to the controller. The positioning drive assembly (3) includes at least one output end. The weighing tanks (404) are installed on the output end in a corresponding manner. Multiple sets of placement boxes (5) are arranged in sequence below the weighing tanks (404) and along the moving direction of the output end of the positioning drive assembly (3).

4. The electrolyte injection device for lithium battery production according to claim 3, characterized in that: At least two adjacent placement boxes (5) constitute a receiving station, and the activity range of each output end of the positioning drive component (3) covers at least two receiving stations.

5. The electrolyte injection device for lithium battery production according to claim 4, characterized in that: The receiving station is also equipped with a feeding component and a pushing component for synchronous loading and unloading of multiple battery housings (7). The feeding component is located on one side of the opening of the placement box (5), and the pushing component is located on the side of the placement box (5) opposite to the opening. The output end of the pushing component pushes multiple battery housings (7) out of the opening.

6. The electrolyte injection device for lithium battery production according to claim 5, characterized in that: The feeding assembly includes a pusher (17) and a pusher plate (18). The pusher plate (18) is installed on the output end of the pusher (17). The movable length of the output end of the pusher (17) is not less than the width of the battery casing (7). During feeding, multiple sets of batteries at the receiving station abut against the pusher plate (18).

7. The electrolyte injection device for lithium battery production according to claim 5, characterized in that: The feeding assembly includes a sloping pad (13), the top of which is flush with the bottom of the opening of the placement box (5) and the sloping surface faces upward.

8. The electrolyte injection device for lithium battery production according to claim 7, characterized in that: Multiple sets of partitions (14) are provided on the inclined surface of the inclined pad (13), and a placement groove is formed between adjacent partitions (14), and the placement groove corresponds one-to-one with the placement box (5).

9. The electrolyte injection device for lithium battery production according to claim 7, characterized in that: The inclined pad (13) is rotatably mounted on the front opening side of the placement box (5) by means of a coil spring (15). The coil spring (15) has a tendency to retract towards the placement box (5). The side wall of the placement box (5) is shorter than the width of the battery housing (7). After the material is loaded, the partition (14) is inserted between the adjacent battery housings (7).

10. The electrolyte injection device for lithium battery production according to claim 1, characterized in that: The infusion assembly includes a storage tank (8), with a feed hopper (9) installed at the inlet of the storage tank (8), and a filter element (11) installed inside the feed hopper (9).

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