Liquid injection device with tab protection

Abstract

The utility model relates to battery manufacturing technology field, specifically disclose a kind of injection device with tab protection function, including upper cavity and with the lower cavity of upper cavity depression, the inner chamber bottom side of upper cavity is equipped with pressing plate, the inner chamber side of lower cavity is equipped with connecting rod mechanism, elastic support mechanism, protective cover assembly, top pressure mechanism, the top pressure mechanism is located in the inner chamber middle portion of lower cavity and with pressing plate is matched, the bottom of top pressure mechanism is hinged with the side of connecting rod mechanism, the inner chamber side of lower cavity is located elastic support mechanism, and elastic support mechanism is hinged with the other side of connecting rod mechanism by protective cover assembly. The scheme can drive the contraction of the connecting rod mechanism assembled in the lower cavity in the process of upper cavity depression, cover the tab of battery cell, form the protection to battery tab, prevent volatile electrolyte condensation into water droplet and drop on tab, cause tab corrosion.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a liquid injection device with tab protection function. Background Technology

[0002] When injecting electrolyte into battery cells, it is necessary to prepare the electrolyte solution, which is a conductive liquid composed of a mixture of various chemical substances. The battery cells to be injected are then packaged in bags. These cells are typically composed of positive and negative electrode materials and a separator. During the injection process, it is also necessary to ensure the cleanliness and proper operation of the injection equipment to guarantee the accuracy and consistency of the injection.

[0003] During the process of injecting electrolyte into the battery cell, water vapor will form due to the evaporation of the electrolyte and adhere to the upper sealing cavity. When the evaporation reaches a certain amount, it will condense into water droplets and drip from the upper sealing cavity. In this process, there is a certain probability that the water droplets will drip onto the battery cell tabs and react chemically with the negative electrode tabs, causing the tabs to corrode. Utility Model Content

[0004] The purpose of this invention is to provide a liquid injection device with tab protection function to solve the problems encountered in the above-mentioned background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A liquid injection device with tab protection includes an upper sealing cavity and a lower sealing cavity pressed down by the upper sealing cavity. The bottom of the inner cavity of the upper sealing cavity is provided with pressure plates on both sides. The inner cavity of the lower sealing cavity is provided with a linkage mechanism, an elastic support mechanism, a protective cover assembly, and a pressing mechanism on both sides. The pressing mechanism is located in the middle of the inner cavity of the lower sealing cavity and matches the pressure plates. The bottom of the pressing mechanism is hinged to one side of the linkage mechanism. The elastic support mechanism is located on both sides of the inner cavity of the lower sealing cavity. The elastic support mechanism is hinged to the other side of the linkage mechanism through the protective cover assembly.

[0007] In the above scheme, the protective cover assembly includes a connecting block and a protective cover. The connecting block is movably installed in the elastic support mechanism. A connecting plate is provided between the connecting blocks located on both sides of the lower sealing cavity. Multiple protective covers are provided and are evenly installed on the inner side of the connecting plate. The number and position of the protective covers match the tabs of the battery cell.

[0008] In the above scheme, the elastic support mechanism includes a guide rod, a spring, and a first linear slide rail. The guide rod is fixed on both sides of the inner cavity of the lower sealing cavity. The connecting block is installed on the guide rod through the first linear slide rail. The conveying direction of the first linear slide rail is the same as the conveying direction of the guide rod. The spring is fitted on the guide rod, and the outer end of the spring abuts against the inner side of the connecting block.

[0009] In one embodiment, the guide rod is a horizontal straight rod, on which a fixing seat is mounted to limit the spring's original position, and the middle part of the guide rod passes through the pressing mechanism without contacting any components of the pressing mechanism.

[0010] In one embodiment, the guide rod is two inclined straight rods arranged in an inverted V-shape, with the straight rods inclined downward at 5-10 degrees; a fixing seat is installed on the guide rod to limit the original position of the spring, one end of the straight rod is fixed to the fixing seat, and the other end of the straight rod is fixed to the inner side of the lower sealing cavity.

[0011] In the above scheme, the top pressing mechanism includes a fixed plate, a pressure rod, a second linear guide rail, and a linkage slide plate. The fixed plate is installed in the upper middle part of the inner cavity of the lower sealing cavity, and the fixed plate is slidably connected to the pressure rod through a linear bearing. The pressure rod is vertically arranged, with its top extending a certain distance and its bottom penetrating through the fixed plate and fixedly connected to the linkage slide plate. The linkage slide plate is slidably connected in the middle of the inner cavity of the lower sealing cavity through the second linear guide rail, which is vertically arranged. The two sides of the linkage slide plate are respectively hinged to one end of the linkage mechanism.

[0012] As a preferred embodiment, the bottom of the fixing plate is provided with limiting posts, which are located on both sides of the pressure rod and at the top of the linkage slide plate.

[0013] Furthermore, the linkage mechanism includes a link, one end of which is hinged to the bottom side of the protective cover assembly via a first fixing pin, and the other end of which is hinged to both sides of the linkage slide via a second fixing pin.

[0014] Additionally, it should be noted that, in order to provide sufficient support during downward pressure, ribs are provided on both sides of the top of the pressure plate. For better positioning of the battery cells, battery cell mounting seats are evenly installed inside the lower sealing cavity, and the top of each battery cell mounting seat has a positioning groove that matches the battery cell.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: By installing a linkage mechanism in the lower sealing cavity of the original electrolyte injection system, this structure can simultaneously drive the linkage mechanism assembled in the lower sealing cavity to retract during the downward pressing of the upper sealing cavity, covering the cell tabs and forming protection for the battery tabs. Using the structure and method shown in this solution, protection of the cell tabs can be achieved during the electrolyte injection process, preventing volatile electrolyte from condensing into water droplets and dripping onto the tabs, causing tab corrosion. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the upper sealing cavity in this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the lower sealing cavity in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the lower sealing cavity after the battery cell has been removed in this utility model;

[0021] Figure 5 This is a schematic diagram of the installation structure of the linkage mechanism, elastic support mechanism, and pressing mechanism in this utility model;

[0022] Figure 6 This is a schematic diagram of the rear structure of the linkage mechanism, elastic support mechanism, and top pressing mechanism in this utility model.

[0023] Numbering in the diagram: 1-Upper sealing cavity; 11-Pressure plate; 12-Rib plate; 2-Lower sealing cavity; 21-Battery cell fixing seat; 22-Positioning groove; 3-Linkage mechanism; 31-Linkage rod; 32-First fixing pin; 33-Second fixing pin; 4-Elastic support mechanism; 41-Guide rod; 42-Fixing seat; 43-Spring; 44-First linear slide rail; 5-Protective cover assembly; 51-Connecting block; 52-Connecting plate; 53-Protective cover; 6-Top pressing mechanism; 61-Fixing plate; 62-Linear bearing; 63-Pressure rod; 64-Second linear guide rail; 65-Linkage sliding plate; 66-Limiting post. Detailed Implementation

[0024] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0025] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0026] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1, as Figures 1 to 3 As shown, a liquid injection device with tab protection function includes an upper sealing chamber 1 and a lower sealing chamber 2 that is pressed down by the upper sealing chamber 1. During operation, the liquid injection system is installed in the upper sealing chamber 1, and the upper sealing chamber 1 is covered on the lower sealing chamber 2, and liquid is completely injected inside.

[0028] Pressure plates 11 are provided on both sides of the bottom of the inner cavity of the upper sealing cavity 1. The pressure plates 11 press down the pressure rod 63 of the top pressing mechanism 6, thereby driving the various mechanisms to initiate a linkage reaction. In order to provide sufficient support force when pressing down, stiffening plates 12 are welded to the top two sides of the pressure plates 11.

[0029] The inner sides of the lower sealing cavity 2 are provided with a connecting rod mechanism 3, an elastic support mechanism 4, a protective cover assembly 5, and a pressing mechanism 6. These mechanisms and assemblies can be directly installed on both sides of the inner cavity of the lower sealing cavity 2, or they can all be installed together on a partition plate, and then the partition plate is fixed to both sides of the inner cavity of the lower sealing cavity 2 with screws.

[0030] The top-pressing mechanism 6 is located in the middle of the inner cavity of the lower sealing cavity 2 and matches the pressure plate 11, so as to facilitate downward pressure through the pressure plate 11, thereby driving the linkage mechanism 3 and the elastic support mechanism 4 in linkage. The bottom of the top-pressing mechanism 6 is hinged to one side of the linkage mechanism 3. When it receives downward pressure, it drives the linkage mechanism 3 to pull down, while the upper part of the linkage mechanism 3 moves towards the middle. The elastic support mechanism 4 is located on both sides of the inner cavity of the lower sealing cavity 2. The elastic support mechanism 4 is hinged to the other side of the linkage mechanism 3 through the protective cover assembly 5. The elastic support mechanism 4 provides a carrier for the reciprocating motion of the protective cover assembly 5. Under the force of the linkage mechanism 3, it drives the protective cover assemblies 5 on both sides to move towards the middle, thereby shielding and protecting the electrode parts of the battery cell from electrolyte dripping onto the electrode parts.

[0031] In addition, to position the battery cell and the electrode tabs, battery cell mounting seats 21 are evenly installed inside the lower sealing cavity 2. The battery cell mounting seats 21 are vertically installed on the bottom surface of the inner cavity of the lower sealing cavity 2. The top of the battery cell mounting seat 21 has a positioning groove 22 that matches the battery cell, which clamps the battery cell and fixes it in a fixed position. When the position of the battery cell is fixed, the position of the electrode on the battery cell will also be fixed, thus facilitating the shielding and protection of the protective cover assembly 5.

[0032] In this application, when the upper sealing cavity 1 presses down on the lower sealing cavity 2 to inject liquid into the battery cell, the pressure plate 11 drives the top pressure mechanism 6 to move downward. The bottom drive linkage mechanism 3 of the top pressure mechanism 6 pulls the protective cover assemblies 5 on both sides toward the middle. Under the guidance of the elastic support mechanism 4, the protective cover assemblies 5 move stably toward the middle. After the protective cover assemblies 5 move from both sides to the inside, they can cover the electrode tabs of the battery cell, thereby protecting it.

[0033] In simple terms, this solution designs a liquid injection device with tab protection. A linkage mechanism 3 is installed in the lower sealing cavity 2 of the original liquid injection system. This structure, during the downward pressing of the upper sealing cavity 1, simultaneously drives the linkage mechanism 3 assembled in the lower sealing cavity 2 to retract, covering the cell tabs and thus protecting them. Using the structure and method shown in this solution, the cell tabs can be protected during the liquid injection process, preventing volatile electrolyte from condensing into water droplets and dripping onto the tabs, causing corrosion.

[0034] Example 2, based on the solution of Example 1, please refer to... Figure 3 and Figure 4 The protective cover assembly 5 includes a connecting block 51 and a protective cover 53. The connecting block 51 is movably installed in the elastic support mechanism 4, mainly by sliding, such as using a linear slide rail. A connecting plate 52 is provided between the connecting blocks 51 located on both sides of the lower sealing cavity 2. The connecting plate 52 connects the connecting blocks 51 on the front and rear sides together. Multiple protective covers 53 are provided and are evenly installed on the inner side of the connecting plate 52, thus forming an integral movable structure. The number and position of the protective covers 53 match the tabs of the battery cell. When the whole structure moves, it protects the tabs of the battery cell by covering them to prevent electrolyte from dripping onto the tabs on both sides of the battery cell.

[0035] Example 3, based on the solution of Example 2, please refer to... Figure 4 and Figure 5 The elastic support mechanism 4 includes a guide rod 41, a spring 43, and a first linear slide rail 44. In assembly, the two ends of the guide rod 41 are fixed to both sides of the inner cavity of the lower sealing cavity 2. The connecting block 51 is slidably mounted on the guide rod 41 via the first linear slide rail 44. The conveying direction of the first linear slide rail 44 is the same as the conveying direction of the guide rod 41. A slider is slidably connected to the first linear slide rail 44, and the slider is fixed to the back of the connecting block 51.

[0036] Spring 43 is fitted onto guide rod 41, with the outer end of spring 43 abutting against the inner side of connecting block 51, ensuring that the mechanism can return to its initial position after the upper sealing cavity 1 moves upward after liquid injection is completed. Guide rod 41 passes through fixed seat 42, connecting block 51, and spring 43, serving as a guide.

[0037] Example 4, based on Example 3, such as Figure 5As shown, in this embodiment, the guide rod 41 is a horizontal straight rod. A fixing seat 42 for limiting the original position of the spring 43 is installed on the guide rod 41. The middle part of the guide rod 41 passes through the pressing mechanism 6 and does not contact the components of the pressing mechanism 6. Due to the elastic pressing of the spring 43, when not injecting liquid, the connecting block 51 and the protective cover 53 are pushed to both sides of the lower sealing cavity 2. During liquid injection, due to the pulling action of the connecting rod mechanism 3, the connecting block 51 and the protective cover 53 move towards the middle to protect the electrode tab. After the liquid injection is completed, after the upper sealing cavity 1 rises, the connecting block 51 and the protective cover 53 return to the positions on both sides of the lower sealing cavity 2 under the elastic pressing of the spring 43.

[0038] Example 5, based on Example 3, in this example, the guide rods 41 are two inclined straight rods arranged in an inverted V-shape. The straight rods are inclined downwards and inwards at 5-10 degrees, which facilitates the inward movement of the connecting block 51 during liquid injection. Due to the small inclination angle, although there is a certain downward movement after movement, the electrode tabs are protected as long as they do not touch them. A fixing seat 42 is installed on the guide rods 41 to retain the original position of the spring 43. The fixing seat 42 positions the spring 43 and presses the connecting block 51. In this example, one end of the straight rod is fixed to the fixing seat 42, and the other end of the straight rod is fixed to the inner side of the lower sealing cavity 2. The middle part does not need to cross or pass through the pressing mechanism 6. Because the two guide rods 41 have an inverted V-shape structure, it is convenient for the connecting rod mechanism 3 to pull the connecting block 51 together, thereby covering the electrode tab of the battery cell.

[0039] Example 6, based on Example 1, please refer to... Figures 4 to 6 The pressing mechanism 6 includes a fixed plate 61, a pressure rod 63, a second linear guide rail 64, and a linkage slide plate 65. The fixed plate 61 is installed in the upper middle part of the inner cavity of the lower sealing cavity 2 so as to cooperate with the pressure rod 11 to press down. The fixed plate 61 is slidably connected to the pressure rod 63 through a linear bearing 62, and the linear bearing 62 guides the pressure rod 63 and allows it to slide smoothly up and down.

[0040] The pressure rod 63 is vertically positioned, with its top extending a certain distance to provide sufficient area for the pressure plate 11 to press down. The bottom of the pressure rod 63 passes through the fixing plate 61 and is fixedly connected to the linkage slide plate 65, which can be secured by plugging and threading. The linkage slide plate 65 is slidably connected to the middle of the inner cavity of the lower sealing cavity 2 via the second linear guide rail 64. The second linear guide rail 64 is vertically positioned, and its back can be seen in [reference needed]. Figure 6 The sliding block 65 moves up and down by interacting with the interior of the lower sealing cavity 2. The two sides of the sliding block 65 are hinged to one end of the linkage mechanism 3. When the sliding block 65 moves up and down, it drives the linkage mechanism 3 on both sides to pull the connecting block 51, thereby moving the protective cover 53 to block the electrode tab of the battery cell and prevent the electrolyte from condensing and dripping.

[0041] As a preferred embodiment, the bottom of the fixing plate 61 is provided with limiting posts 66, which are located on both sides of the pressure rod 63 and at the top of the linkage slide plate 65. Under the elastic pressure of the spring 43, the fixing plate 61 is normally pulled by the connecting block 51 to the lower part of the limiting posts 66. Only during the liquid injection process, after being pressed down by the pressure rod 63, the linkage slide plate 65 moves downward, thereby moving away from the limiting posts 66. Furthermore, the presence of the limiting posts 66 also prevents the linkage slide plate 65 from touching the guide rod 41.

[0042] Example 7, based on Example 1, specifically, the linkage mechanism 3 includes a link 31. One end of the link 31 is hinged to the bottom side of the protective cover assembly 5 via a first fixing pin 32, specifically connected to the lower part of the connecting block 51. The other end of the link 31 is hinged to both sides of the linkage slide plate 65 via a second fixing pin 33. By pressing down the pressure rod 63 in the lower sealing cavity 2 through the pressure plate 11 in the upper sealing cavity 1, the linkage slide plate 65 is driven to move downward, and then the link 31 pulls the protective cover assembly 5 towards the center to protect the tabs of the battery cell installed in the lower sealing cavity 2.

[0043] Based on the solutions in Examples 1-7, the operation flow of this device can be simply summarized as follows:

[0044] The upper sealing cavity 1 presses down, causing the pressure plate 11 to press down, thus applying force to the pressure rod 63. Since the pressure rod 63 is connected to the linkage slide plate 65, it causes the linkage slide plate 65 to move downward. During the movement of the linkage slide plate 65, it causes the connecting rod 31 to move. The movement of the connecting rod 31 causes the connecting block 51 to move. The movement of the connecting block 51 ultimately causes the connecting plate 52 and the protective cover 53 fixed on it to retract and move towards the center at the same time, thus completing the protection process for the electrode tab. At this time, the liquid injection system in the liquid injection device begins to evacuate and inject liquid. After completion, the upper sealing cavity 1 opens, and under the action of the spring 43, the protective cover assembly 5 returns to the positions on both sides, and the liquid injection process is completed.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A liquid injection device with tab protection function, characterized in that: The upper sealing cavity (1) and the lower sealing cavity (2) are pressed down by the upper sealing cavity (1). The bottom of the upper sealing cavity (1) is provided with pressure plates (11) on both sides. The lower sealing cavity (2) is provided with a linkage mechanism (3), an elastic support mechanism (4), a protective cover assembly (5) and a top pressing mechanism (6) on both sides. The top pressing mechanism (6) is located in the middle of the lower sealing cavity (2) and matches the pressure plates (11). The bottom of the top pressing mechanism (6) is hinged to one side of the linkage mechanism (3). The elastic support mechanism (4) is located on both sides of the lower sealing cavity (2). The elastic support mechanism (4) is hinged to the other side of the linkage mechanism (3) through the protective cover assembly (5).

2. The liquid injection device with tab protection function according to claim 1, characterized in that: The protective cover assembly (5) includes a connecting block (51) and a protective cover (53). The connecting block (51) is movably installed in the elastic support mechanism (4). A connecting plate (52) is provided between the connecting blocks (51) on both sides of the lower sealing cavity (2). Multiple protective covers (53) are provided and are evenly installed on the inner side of the connecting plate (52). The number and position of the protective covers (53) match the tabs of the battery cell.

3. The liquid injection device with tab protection function according to claim 2, characterized in that: The elastic support mechanism (4) includes a guide rod (41), a spring (43), and a first linear slide rail (44). The guide rod (41) is fixed on both sides of the inner cavity of the lower sealing cavity (2). The connecting block (51) is mounted on the guide rod (41) through the first linear slide rail (44). The conveying direction of the first linear slide rail (44) is the same as the conveying direction of the guide rod (41). The spring (43) is fitted on the guide rod (41), and the outer end of the spring (43) abuts against the inner side of the connecting block (51).

4. The liquid injection device with tab protection function according to claim 3, characterized in that: The guide rod (41) is a horizontal straight rod. A fixing seat (42) that restricts the spring (43) to its original position is installed on the guide rod (41). The middle part of the guide rod (41) passes through the pressing mechanism (6) and does not contact the components of the pressing mechanism (6).

5. A liquid injection device with tab protection function according to claim 3, characterized in that: The guide rod (41) consists of two inclined straight rods arranged in an inverted V-shape, with the straight rods tilted downwards at 5-10 degrees. A fixing seat (42) is installed on the guide rod (41) to restrict the original position of the spring (43). One end of the straight rod is fixed on the fixing seat (42), and the other end of the straight rod is fixed on the inner side of the lower sealing cavity (2).

6. The liquid injection device with tab protection function according to claim 1, characterized in that: The top pressing mechanism (6) includes a fixed plate (61), a pressure rod (63), a second linear guide rail (64), and a linkage slide plate (65). The fixed plate (61) is installed in the upper middle part of the inner cavity of the lower sealing cavity (2). The fixed plate (61) is slidably connected to the pressure rod (63) through a linear bearing (62). The pressure rod (63) is vertically set, with its top extending a certain distance and its bottom penetrating through the fixed plate (61) and fixedly connected to the linkage slide plate (65). The linkage slide plate (65) is slidably connected to the middle of the inner cavity of the lower sealing cavity (2) through the second linear guide rail (64). The second linear guide rail (64) is vertically set. The two sides of the linkage slide plate (65) are respectively hinged to one end of the linkage mechanism (3).

7. A liquid injection device with tab protection function according to claim 6, characterized in that: The bottom of the fixed plate (61) is provided with a limiting post (66), which is located on both sides of the pressure rod (63) and on the top of the linkage slide plate (65).

8. A liquid injection device with tab protection function according to claim 6, characterized in that: The linkage mechanism (3) includes a link (31), one end of which is hinged to the bottom side of the protective cover assembly (5) via a first fixing pin (32), and the other end of which is hinged to both sides of the linkage slide plate (65) via a second fixing pin (33).

9. A liquid injection device with tab protection function according to claim 1, characterized in that: The pressure plate (11) is provided with stiffening plates (12) on both sides of its top.

10. A liquid injection device with tab protection function according to claim 1, characterized in that: The lower sealing cavity (2) is uniformly equipped with a cell fixing seat (21), and the top of the cell fixing seat (21) is provided with a positioning groove (22) that matches the cell.

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