A liquid injection device for lithium battery
By designing a liquid injection mechanism and a battery positioning mechanism, the battery liquid injection is completed using gravity and static pressure, which solves the problems of complex structure and high cost of existing equipment. It achieves efficient and low-cost simultaneous liquid injection of multiple batteries, and is suitable for cost-sensitive production lines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG ZHONGMO POWER TECH CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-14
AI Technical Summary
Existing lithium battery liquid injection equipment is complex in structure, expensive, and lacks modularity and scalability, making it difficult to meet the precision and consistency requirements of cost-sensitive production lines.
A liquid injection device for lithium batteries has been designed, including a liquid injection mechanism and a battery positioning mechanism. Through the cooperation of multiple liquid injection cups and a replenishment mechanism, the liquid injection of the battery is achieved by using gravity and the static pressure inside the cup provided by the first driving mechanism. The replenishment mechanism is independent of the main liquid injection mechanism and can replenish the liquid during the liquid injection interval or at a specific station, reducing waiting time.
It significantly improves production efficiency, reduces equipment costs and maintenance difficulty, is easy to integrate into existing production lines, and enables simultaneous liquid injection of multiple batteries without affecting the liquid injection cycle.
Smart Images
Figure CN224502302U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid injection device technology, and in particular to a liquid injection device for lithium batteries. Background Technology
[0002] Lithium-ion battery electrolyte filling is one of the core processes in cell manufacturing. Its goal is to precisely, efficiently, and uniformly inject electrolyte into the dried cell, ensuring full wetting of the electrodes and separator. This process directly affects the battery's capacity, cycle life, safety, and consistency. With the ever-increasing demands for battery performance from the new energy industry, electrolyte filling equipment technology has evolved from manual operation to semi-automation, and then to high-precision fully automatic intelligent operation. Current technological advancements focus on multi-technology integration and intelligentization: Dynamic pressure control: Adjusting the pressure curve in real time based on electrolyte viscosity and electrode thickness to optimize wetting kinetics. Multi-level isolation chambers: Transferring cells through buffer chambers to maintain high cleanliness in the main chamber and reduce air contamination. Modular parallel electrolyte filling: Processing multiple cells simultaneously with a single machine to increase production capacity. Data traceability and AI optimization: Integrating sensors and MES systems to achieve process parameter monitoring, electrolyte volume prediction, and adaptive adjustment. Based on existing technologies, electrolyte filling equipment still faces many challenges. For example, the difficulty of deep wetting of thick electrode cells has spurred the development of auxiliary technologies such as ultrasonication and centrifugation; the balance between filling accuracy and speed requires more precise fluid control algorithms; and the rise of solid-state batteries may drive innovation in semi-solid electrolyte filling equipment. Lithium-ion battery electrolyte filling equipment has evolved from single-function machinery to intelligent systems integrating multiple disciplines (fluid mechanics, vacuum technology, materials science, and automatic control). The core objective is to achieve high-precision, rapid wetting, and large-volume electrolyte injection in an ultra-low-pollution environment, providing crucial support for high-performance battery manufacturing.
[0003] Existing lithium battery liquid injection equipment needs to be adjusted accordingly to meet the specific requirements of different production scenarios. For cost-sensitive production lines where injection accuracy and consistency requirements are not high, existing lithium battery liquid injection equipment is complex in structure, expensive, and lacks modularity and scalability. Utility Model Content
[0004] Therefore, it is necessary to provide a lithium battery liquid injection device to address the technical problems of complex structure and high cost of existing lithium battery liquid injection devices.
[0005] A liquid injection device for lithium batteries includes a liquid injection mechanism and a battery positioning mechanism. The output end of the liquid injection mechanism is located at the bottom end of the liquid injection mechanism, and the battery positioning mechanism is located on the bottom side of the output end of the liquid injection mechanism.
[0006] The liquid injection mechanism includes a first driving mechanism, a plurality of liquid injection cups, and a liquid replenishment mechanism; the first driving mechanism is located on the top side of the battery positioning mechanism, and the output end of the first driving mechanism faces the bottom side; the plurality of liquid injection cups are located on the output end of the first driving mechanism, and the output port of each liquid injection cup faces the battery positioning mechanism; the liquid replenishment mechanism is located on one side of the first driving mechanism, and the output end of the liquid replenishment mechanism is connected to the side wall of the plurality of liquid injection cups.
[0007] The fluid replenishment mechanism includes a connecting bracket, a second driving mechanism, and several injection tubes. The connecting bracket is connected to the first driving mechanism. The second driving mechanism is mounted on the connecting bracket, and its output end faces several injection cups. Several injection tubes are located at the output end of the second driving mechanism, and each injection tube corresponds to one injection cup. Correspondingly, each injection cup has an injection hole corresponding to an injection tube, and the injection hole is located on the side wall of the injection cup.
[0008] In one embodiment, the first driving mechanism includes a lifting driving mechanism, a movable seat, and a plurality of first cylinders. The lifting driving mechanism is disposed on both sides of the battery positioning mechanism, and the output end of the lifting driving mechanism is disposed facing the top side. The movable seat is connected to the output end of the lifting driving mechanism. A plurality of liquid injection cups are installed at the bottom of the movable seat, and a plurality of first cylinders are respectively installed on the top of the movable seat corresponding to a plurality of liquid injection cups, and the output end of each first cylinder is correspondingly connected to the static pressure input end of the liquid injection cup.
[0009] In one embodiment, the aforementioned movable seat includes a base plate and a top bracket. The base plate is connected to the output end of the lifting drive mechanism at a preset liquid injection station corresponding to the battery positioning mechanism. The top bracket is installed on the top side surface of the base plate.
[0010] In one embodiment, the aforementioned plurality of injection cups are mounted on a base plate and disposed on the bottom side of a top bracket; a plurality of first cylinders are mounted on the top of the top bracket.
[0011] In one embodiment, the aforementioned connecting bracket is connected to both sides of the top bracket.
[0012] In one embodiment, the lifting drive mechanism includes two lifting cylinders, which are respectively disposed on both sides of the battery positioning mechanism, and the output ends of the two lifting cylinders are respectively connected to both ends of the base plate.
[0013] In one embodiment, the second driving mechanism includes a movable plate and a second cylinder. The second cylinder is mounted on a connecting bracket, and its output end extends toward the side wall of the injection cup. The movable plate is connected to the output end of the second cylinder.
[0014] In one embodiment, the aforementioned plurality of injection tubes are mounted on a movable plate corresponding to a plurality of injection cups.
[0015] In one embodiment, the battery positioning mechanism includes a horizontal drive mechanism and a positioning groove. The horizontal drive mechanism is laid between two lifting cylinders, and the positioning groove is located at the output end of the horizontal drive mechanism.
[0016] In one embodiment, the aforementioned horizontal drive mechanism is provided with a horizontally positioned cylinder drive mechanism to drive the positioning groove to move horizontally in a preset direction.
[0017] The aforementioned lithium battery electrolyte injection device drives multiple batteries to the injection station simultaneously through a battery positioning mechanism. Combined with a design using multiple injection cups, this simple injection structure enables simultaneous injection of multiple batteries, significantly improving production efficiency and greatly reducing equipment costs. Furthermore, the injection cup, serving as an intermediate container for the electrolyte and the injection execution unit, primarily relies on gravity and the static pressure within the cup provided by the first driving mechanism to complete the battery injection action. Compared to complex dynamic pressure and vacuum systems, this structure has lower mechanical complexity, making manufacturing costs and maintenance relatively controllable, and it is easy to integrate into existing production lines or as a standalone module. The replenishment mechanism is independent of the main injection mechanism, and replenishment occurs on the side wall of the injection cup. The injection tube is inserted into the cup through the injection hole, allowing replenishment to be performed during injection intervals or at specific stations without affecting the injection cycle. Moreover, the replenishment mechanism can replenish the empty cup with electrolyte simultaneously with or after the injection of a batch of batteries, preparing for the next batch of battery injection and reducing waiting time. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of a liquid injection device for a lithium battery in one embodiment;
[0019] Figure 2 This is a schematic diagram of the exploded structure of a liquid injection device for a lithium battery in one embodiment. Detailed Implementation
[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0021] 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.
[0022] 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.
[0023] 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, 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.
[0024] 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.
[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0026] Please see Figures 1 to 2This utility model discloses a liquid injection device 1 for lithium batteries. The liquid injection device 1 for lithium batteries includes a liquid injection mechanism 10 and a battery positioning mechanism 20. The output end of the liquid injection mechanism 10 is disposed at the bottom end of the liquid injection mechanism 10, and the battery positioning mechanism 20 is disposed at the bottom side of the output end of the liquid injection mechanism 10. The battery positioning mechanism 20 is used to receive and drive several batteries to be positioned at the bottom side of the output end of the liquid injection mechanism 10, so that the liquid injection mechanism 10 can perform liquid injection on several batteries. Specifically, the liquid injection mechanism 10 includes a first driving mechanism 11, a plurality of liquid injection cups 12, and a liquid replenishment mechanism 13; the first driving mechanism 11 is disposed on the top side of the battery positioning mechanism 20, and the output end of the first driving mechanism 11 is disposed facing the bottom side; the plurality of liquid injection cups 12 are disposed on the output end of the first driving mechanism 11, and the output port of each liquid injection cup 12 is disposed facing the battery positioning mechanism 20; the liquid replenishment mechanism 13 is disposed on one side of the first driving mechanism 11, and the output end of the liquid replenishment mechanism 13 is connected to the side wall of the plurality of liquid injection cups 12 to perform liquid replenishment work on each liquid injection cup 12. More specifically, the fluid replenishment mechanism 13 includes a connecting bracket 131, a second driving mechanism 132, and a plurality of injection tubes 133. The connecting bracket 131 is connected to the first driving mechanism 11. The second driving mechanism 132 is mounted on the connecting bracket 131, and the output end of the second driving mechanism 132 is positioned towards the plurality of injection cups 12. The plurality of injection tubes 133 are positioned at the output end of the second driving mechanism 132, and each of the plurality of injection tubes 133 corresponds one-to-one with a plurality of injection cups 12. Accordingly, each injection cup 12 is provided with an injection hole a corresponding to an injection tube 133, and the injection hole a is located on the side wall of the injection cup 12. Based on this, the second driving mechanism 132 can drive the plurality of injection tubes 133 to penetrate into the corresponding injection cup 12 through the corresponding injection hole a, and then complete the fluid replenishment work of the plurality of injection cups 12 through the plurality of injection tubes 133. Based on the above configuration, the lithium battery injection device 1 of this utility model drives multiple batteries to the injection station simultaneously through the battery positioning mechanism 20. With the design of multiple injection cups 12, multiple batteries can be injected simultaneously, thereby significantly improving production efficiency. Furthermore, the injection cup 12, as an intermediate container for electrolyte and injection execution unit, mainly relies on gravity and the static pressure inside the cup provided by the first driving mechanism 11 to complete the injection action. Compared with complex dynamic pressure and vacuum systems, this structure has lower mechanical complexity, and the manufacturing cost and maintenance difficulty may be relatively controllable. It is easy to integrate into existing production lines or as an independent module. The replenishment mechanism 13 is independent of the main injection mechanism 10, and the replenishment is carried out on the side wall of the injection cup 12. The injection tube 133 is inserted into the cup through the injection hole a, and replenishment can be carried out during the injection interval or at a specific station without affecting the injection cycle. Moreover, it can realize that while the injection cup 12 is injecting electrolyte into a batch of batteries, the replenishment mechanism 13 can replenish the empty cup with electrolyte to prepare for the next batch of batteries and reduce waiting time.
[0027] Furthermore, the first drive mechanism 11 includes a lifting drive mechanism 111, a movable seat 112, and a plurality of first cylinders 113. The lifting drive mechanism 111 is disposed on both sides of the battery positioning mechanism 20, and the output end of the lifting drive mechanism 111 faces the top. The movable seat 112 is connected to the output end of the lifting drive mechanism 111. A plurality of injection cups 12 are installed at the bottom of the movable seat 112, and a plurality of first cylinders 113 are respectively installed on the top of the movable seat 112 corresponding to a plurality of injection cups 12, and the output end of each first cylinder 113 is connected to the static pressure input end of the injection cup 12. Based on the above configuration, the lifting drive mechanism 111 can drive the movable seat 112 to lift relative to the battery positioning mechanism 20, so as to avoid the battery loading process of the battery positioning mechanism 20; the plurality of injection cups 12 move with the movable seat 112 to realize the engagement and disengagement of the output end of each injection cup 12 with the corresponding battery injection channel; and the plurality of first cylinders 113 can output static pressure to the corresponding injection cup 12 to realize the injection action.
[0028] Furthermore, the movable seat 112 includes a base plate 1121 and a top bracket 1122. The base plate 1121 is connected to the output end of the lifting drive mechanism 111 corresponding to the preset liquid injection position of the battery positioning mechanism 20. The top bracket 1122 is installed on the top side surface of the base plate 1121. Based on this, specifically, in one embodiment, a plurality of liquid injection cups 12 are installed on the base plate 1121 and disposed on the bottom side of the top bracket 1122; a plurality of first cylinders 113 are installed on the top of the top bracket 1122, thereby achieving stable installation of the liquid injection cups 12 and the corresponding first cylinders 113; in another embodiment, a connecting bracket 131 is connected to both sides of the top bracket 1122, thereby achieving stable installation of the liquid replenishment mechanism 13.
[0029] Furthermore, the lifting drive mechanism 111 includes two lifting cylinders 1111, which are respectively disposed on both sides of the battery positioning mechanism 20, and the output ends of the two lifting cylinders 1111 are respectively connected to both ends of the base plate 1121 to realize the lifting action of the base plate 1121.
[0030] Furthermore, the second drive mechanism 132 includes a movable plate 1321 and a second cylinder 1322. The second cylinder 1322 is mounted on the connecting bracket 131, and its output end extends toward the side wall of the injection cup 12. The movable plate 1321 is connected to the output end of the second cylinder 1322, enabling the second cylinder 1322 to drive the movable plate 1321 to reciprocate toward the side wall of the injection cup 12. Based on this, a plurality of injection tubes 133 are mounted on the movable plate 1321 corresponding to a plurality of injection cups 12, thereby enabling each injection tube 133 to move relative to the movable plate 1321, realizing the engagement and disengagement of the injection tube 133 with the corresponding injection hole a.
[0031] Furthermore, the battery positioning mechanism 20 includes a horizontal drive mechanism 21 and a positioning groove 22. The horizontal drive mechanism 21 is positioned between two lifting cylinders 1111, and the positioning groove 22 is located at the output end of the horizontal drive mechanism 21. This allows the horizontal drive mechanism 21 to drive the positioning groove 22 to reciprocate, facilitating the insertion of several lithium batteries to be injected into the positioning groove 22, or the removal of several lithium batteries after injection from the positioning groove 22. Specifically, in one embodiment, the horizontal drive mechanism 21 is equipped with a horizontally positioned cylinder drive mechanism to drive the positioning groove 22 to move horizontally in a preset direction.
[0032] In summary, the lithium battery electrolyte injection device disclosed in this utility model drives multiple batteries to the electrolyte injection station simultaneously through a battery positioning mechanism. Combined with a design of multiple injection cups, it achieves simultaneous electrolyte injection of multiple batteries with a simple injection structure, thereby significantly improving production efficiency and greatly reducing equipment-related costs. Furthermore, the injection cup, as an intermediate container for the electrolyte and the injection execution unit, mainly relies on gravity and the static pressure inside the cup provided by the first driving mechanism to complete the electrolyte injection action. Compared to complex dynamic pressure and vacuum systems, this structure has lower mechanical complexity, and its manufacturing cost and maintenance difficulty are relatively controllable, making it easy to integrate into existing production lines or as a standalone module. The replenishment mechanism is independent of the main injection mechanism, and replenishment is performed on the side wall of the injection cup. The injection tube is inserted into the cup through the injection hole, allowing replenishment to be performed during injection intervals or at specific stations without affecting the injection cycle. Moreover, the replenishment mechanism can replenish the empty cup with electrolyte simultaneously with or after the injection of a batch of batteries, preparing for the next batch of batteries and reducing waiting time.
[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A liquid injection device for lithium batteries, characterized in that, include: The liquid injection mechanism and the battery positioning mechanism are located at the bottom of the liquid injection mechanism and at the bottom side of the output end of the liquid injection mechanism. The liquid injection mechanism includes a first drive mechanism, a plurality of liquid injection cups, and a liquid replenishment mechanism; the first drive mechanism is located on the top side of the battery positioning mechanism, and the output end of the first drive mechanism faces the bottom side; the plurality of liquid injection cups are located on the output end of the first drive mechanism, and the output port of each liquid injection cup faces the battery positioning mechanism; the liquid replenishment mechanism is located on one side of the first drive mechanism, and the output end of the liquid replenishment mechanism is connected to the side wall of the plurality of liquid injection cups. The fluid replenishment mechanism includes a connecting bracket, a second driving mechanism, and several injection tubes. The connecting bracket is connected to the first driving mechanism. The second driving mechanism is mounted on the connecting bracket, and its output end faces several injection cups. Several injection tubes are located at the output end of the second driving mechanism, and each injection tube corresponds to one injection cup. Correspondingly, each injection cup has an injection hole corresponding to an injection tube, and the injection hole is located on the side wall of the injection cup.
2. The electrolyte injection device for lithium batteries according to claim 1, characterized in that, The first drive mechanism includes a lifting drive mechanism, a movable seat, and several first cylinders. The lifting drive mechanism is located on both sides of the battery positioning mechanism, and the output end of the lifting drive mechanism faces the top. The movable seat is connected to the output end of the lifting drive mechanism. Several liquid injection cups are installed at the bottom of the movable seat, and several first cylinders are installed on the top of the movable seat corresponding to several liquid injection cups. The output end of each first cylinder is connected to the static pressure input end of the liquid injection cup.
3. The electrolyte injection device for lithium batteries according to claim 2, characterized in that, The movable seat includes a base plate and a top bracket. The base plate is connected to the output end of the lifting drive mechanism at the preset liquid injection position of the battery positioning mechanism. The top bracket is installed on the top side surface of the base plate.
4. The electrolyte injection device for lithium batteries according to claim 3, characterized in that, Several injection cups are installed on the base plate and set on the bottom side of the top bracket; several first cylinders are installed on the top of the top bracket.
5. The electrolyte injection device for lithium batteries according to claim 4, characterized in that, The connecting brackets are attached to both sides of the top bracket.
6. The electrolyte injection device for lithium batteries according to claim 5, characterized in that, The lifting drive mechanism includes two lifting cylinders, which are respectively located on both sides of the battery positioning mechanism, and the output ends of the two lifting cylinders are respectively connected to the two ends of the base plate.
7. The electrolyte injection device for lithium batteries according to claim 6, characterized in that, The second drive mechanism includes a movable plate and a second cylinder. The second cylinder is mounted on a connecting bracket, and its output end extends toward the side wall of the injection cup. The movable plate is connected to the output end of the second cylinder.
8. The electrolyte injection device for lithium batteries according to claim 7, characterized in that, Several injection tubes are installed on the movable plate, corresponding to several injection cups.
9. The electrolyte injection device for lithium batteries according to claim 8, characterized in that, The battery positioning mechanism includes a horizontal drive mechanism and a positioning groove. The horizontal drive mechanism is laid between two lifting cylinders, and the positioning groove is located at the output end of the horizontal drive mechanism.
10. The electrolyte injection device for lithium batteries according to claim 9, characterized in that, The horizontal drive mechanism is equipped with a horizontally positioned cylinder drive mechanism to drive the positioning groove to move horizontally in a preset direction.