A liquid injection device for an electric cell

Abstract

The utility model discloses a kind of electric core liquid injection device, support, the support is sequentially provided with electric core tray, liquid injection cylinder from bottom to top, the electric core tray with the liquid injection cylinder vertical distance adjustable;Liquid injection rod is slidably arranged in the liquid injection cylinder and the bottom is equipped with lower liquid nozzle;Through liquid injection cylinder, it is formed negative pressure to electric core by air extraction first, and then injects quantitative electrolyte to electric core by liquid injection cylinder, different quantitative electrolyte can be injected according to different model electric core, simultaneously, also, because of the negative pressure state in electric core, the infiltration speed of electrolyte is accelerated to increase.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery core liquid injection, especially a battery core liquid injection device. BACKGROUND

[0002] In the production process of the battery core, it is necessary to inject a certain amount of electrolyte into the battery core, and the injection amount required by different models of battery cores is not the same, or the same battery core can also be different according to the required injection amount under different use conditions.

[0003] The battery core liquid injection device and the full-automatic liquid injection machine of the prior art patent CN108063213B can inject a certain amount of electrolyte into the battery core, but it is difficult to position the battery core during use, which causes the electrolyte to spill during the injection of the battery core, thereby affecting the accuracy of the injection of the battery core. Therefore, a battery core liquid injection device that can accurately inject a certain amount of electrolyte is needed. SUMMARY

[0004] To solve the technical problems in the background art, the utility model provides a battery core liquid injection device, which comprises:

[0005] The support is provided with a battery core tray and a liquid injection cylinder from bottom to top, and the vertical distance between the battery core tray and the liquid injection cylinder is adjustable. A liquid injection rod is slidably arranged in the liquid injection cylinder, and a lower liquid outlet is arranged at the bottom of the liquid injection rod.

[0006] It also comprises a liquid storage tank, which is connected to the liquid injection cylinder through a connecting pipe to provide a certain amount of electrolyte to the battery core. A first valve is arranged on the side wall of the liquid injection cylinder to control the connection and disconnection between the liquid injection cylinder and the liquid storage tank.

[0007] That is, when a certain amount of electrolyte needs to be injected into the battery core, a certain amount of electrolyte is first added to the liquid storage tank, the battery core tray is moved to make the battery core injection port communicate with the lower liquid outlet of the liquid injection cylinder, the liquid injection rod is stretched upwards to make the liquid injection cylinder and the battery core in a negative pressure state, and the first valve is opened to make the electrolyte in the liquid storage tank enter the liquid injection cylinder and flow into the battery core through the lower liquid outlet. Then the compression rod is moved to the bottom, at which time the gas in the cavity will be discharged into the electrolyte tank through the gas pipe, and then discharged in the form of bubbles. Repeated stretching action can increase the injection amount until the electrolyte in the liquid storage tank is completely consumed, thereby realizing quantitative vacuum injection.

[0008] Preferably, the battery core tray is slidably installed on the support and provided with a driving member at the bottom, which drives the battery core tray to rise to the communication between the battery core injection port and the lower liquid outlet.

[0009] That is, the battery core tray is driven by the driving member to drive the battery core until the injection port communicates with the lower liquid outlet, and then the electrolyte is transferred into the battery core after the liquid injection cylinder is vacuumized, so as to quantitatively supplement the electrolyte in the battery core.

[0010] Preferably, the bracket package consists of a top plate and a bottom plate, with multiple support rods arranged between the top plate and the bottom plate. The driving component is an elastic element and is sleeved on the support rods. The elastic element is located between the cell tray and the bottom plate.

[0011] When electrolyte needs to be injected into the battery cell, the battery cell tray can be pressed first to compress the spring, and then the battery cell can be placed on the battery cell tray. After the spring returns to its original position, the battery cell injection port will be connected to the lower liquid nozzle.

[0012] Preferably, the liquid outlet is provided with a sealing head on the outside, and the bottom of the sealing head is provided with a discharge port;

[0013] That is, by setting a sealing rubber head, the liquid nozzle at the bottom of the liquid injection cylinder is sealed to the interface of the liquid injection hole of the battery cell, thereby preventing electrolyte and vacuum leakage;

[0014] Preferably, the bracket is further provided with a snap-fit ​​component, which includes two opposing semi-circular clamps. The two semi-circular clamps have grooves on opposite sides, and the outer wall of the injection cylinder has protrusions that match the grooves. The two semi-circular clamps can be detachably fixed.

[0015] That is, it is fastened to the outside of the injection cylinder by two circular clamps, and the two circular clamps can be locked by bolts for secondary positioning, further ensuring the stable setting of the injection cylinder;

[0016] Preferably, the bottom of the injection cylinder is conical;

[0017] By setting the bottom of the injection cylinder to a cone shape, the electrolyte can flow smoothly into the battery cell when it enters the injection cylinder, which greatly avoids electrolyte residue at the bottom of the injection cylinder, thus preventing further impact on the quantitative injection accuracy of the electrolyte into the battery cell.

[0018] Preferably, the bottom of the injection rod is provided with a conical protrusion, and a sealing ring is sleeved on the outside of the conical protrusion;

[0019] That is, by setting the outer side of the conical protrusion of the sealing ring, the bottom cavity of the injection cylinder is kept in a sealed state, which further ensures the quantitative accuracy of the electrolyte.

[0020] Preferably, the liquid storage tank is made of a transparent material and has capacity markings on its outer wall;

[0021] When the required amount of electrolyte is different, the amount of electrolyte added to the storage tank can be determined by the capacity scale on the storage tank. At the same time, the amount of electrolyte injected into the battery cell can also be determined by whether there is any electrolyte remaining in the storage tank.

[0022] Preferably, the side wall of the injection cylinder is provided with a second valve, and the injection nozzle is also provided with a third valve. The second valve is used to discharge the gas extracted from the cylinder, and the third valve is used to control the connection and disconnection between the injection cylinder and the battery cell.

[0023] First, add a measured amount of electrolyte to the storage tank. Use the injection rod to purge the gas from the injection cylinder. Then, connect the cell injection port to the lower nozzle and open the third valve. Pull the injection rod upward to put the cell under negative pressure and close the third valve. Then, open the second valve to purge the gas from the injection cylinder and close it. Pull the injection rod upward again and open the first valve to allow all the liquid in the storage tank to flow into the injection cylinder due to the negative pressure. Finally, open the third valve to inject all the electrolyte into the cell.

[0024] Preferably, the injection cylinder is made of a transparent material and has capacity graduation lines marked on its outer wall;

[0025] By using a transparent injection cylinder, air can be extracted and the mark can be made when extracting gas from the battery cell. After the air is extracted, the injection rod can be pulled back to the mark. Then, electrolyte from the storage tank can be drawn into the injection cylinder and injected into the battery cell. In other words, by extracting air, even after a certain amount of electrolyte has been injected, the remaining electrolyte on the tube wall can still be pushed back into the battery cell by continuing to inject the remaining air, thus further improving the accuracy of quantitative electrolyte injection into the battery cell.

[0026] This invention first creates a negative pressure in the battery cell by evacuating the air through the injection cylinder, and then injects a fixed amount of electrolyte into the battery cell through the injection cylinder. This allows for the injection of different amounts of electrolyte according to different models of battery cells. At the same time, the negative pressure state inside the battery cell also accelerates the wetting speed of the electrolyte. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a front view of the present utility model;

[0029] Figure 3 This is a schematic diagram of the liquid injection cylinder structure in this utility model;

[0030] Figure 4 This is a schematic diagram of the card connector structure in this utility model;

[0031] Figure 5 This is a schematic diagram of the liquid injection cylinder structure in this utility model;

[0032] Figure descriptions: 1. Bracket; 2. Injection cylinder; 3. Clip-on component; 4. Elastic component; 5. Liquid storage tank; 6. First valve; 11. Pull rod; 12. Support rod; 13. Battery cell tray; 15. Boss; 24. Injection rod; 25. Sealing ring; 26. Discharge nozzle; 31. Semi-circular clamp; 32. Groove; 22. Protrusion. Detailed Implementation

[0033] 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.

[0034] like Figures 1-4 The device shown is a battery cell liquid injection device, with a bracket 1. The bracket 1 is provided with a battery cell tray 13 and a liquid injection cylinder 2 arranged sequentially from bottom to top. The vertical distance between the battery cell tray 13 and the liquid injection cylinder 2 is adjustable. A liquid injection rod 24 is slidably arranged inside the liquid injection cylinder 2, and a liquid outlet is provided at the bottom of the liquid injection cylinder 2.

[0035] It also includes a storage tank 5, which is connected to the injection cylinder 2 via a connecting pipe to provide a certain amount of electrolyte to the battery cell through the injection cylinder 2; the injection cylinder 2 is also provided with a first valve 6, which is used to control the connection and disconnection between the injection cylinder 2 and the storage tank 5;

[0036] When a fixed amount of electrolyte needs to be injected into the battery cell, a fixed amount of electrolyte can be added to the storage tank 5 first. The injection rod 24 can be moved to the bottom of the injection cylinder 2 to expel the air in the injection cylinder 2. Then, the battery cell tray 13 is moved so that the battery cell injection port is connected to the lower nozzle of the injection cylinder 2. The injection rod 24 is pulled upward to make the injection cylinder 2 and the battery cell a negative pressure state, and the first valve 6 is opened so that the electrolyte in the storage tank 5 enters the injection cylinder 2 and flows into the battery cell through the lower nozzle. Then, the compression rod is pulled to the bottom. At this time, the gas in the cavity will be discharged into the bottom of the electrolyte tank through the gas pipe and then discharged from the liquid surface in the form of bubbles. At this time, the electrolyte just plays a liquid seal role, that is, the liquid seal can ensure that the discharged gas or air will not enter the battery cell and the injection cylinder. Repeated pulling action can increase the injection volume until all the electrolyte in the storage tank 5 is exhausted, thereby realizing a fixed amount of vacuum injection.

[0037] In a further embodiment, the cell tray 13 is slidably mounted on the bracket 1 and has a driving component at the bottom. The driving component drives the cell tray 13 to rise to the cell filling port and communicate with the lower liquid nozzle.

[0038] That is, the driving component drives the cell tray to move the cell until the liquid injection port and the liquid outlet are connected. Then, the electrolyte is transferred into the cell after the cell is evacuated by the liquid injection cylinder, so as to make quantitative liquid replenishment to the cell.

[0039] The difference between this embodiment and the previous embodiment is that the driving component is mounted on the bracket and is used to drive the injection cylinder 2 to rise and fall.

[0040] That is, the driving component drives the cell tray to move the cell until the liquid injection port and the liquid outlet are connected. Then, the electrolyte is transferred into the cell after the cell is evacuated by the liquid injection cylinder, so as to make quantitative liquid replenishment to the cell.

[0041] In a further embodiment, the bracket 1 is connected to a top plate and a bottom plate, and multiple support rods 12 are provided between the top plate and the bottom plate. The driving component is an elastic component and is sleeved on the support rods 12. The elastic component 4 is located between the cell tray 13 and the bottom plate. The elastic component can be a spring.

[0042] When electrolyte needs to be injected into the battery cell, the battery cell tray 13 can be pressed first to compress the spring, and then the battery cell can be placed on the battery cell tray 13. After the spring returns to its original position, the battery cell injection port will be connected to the liquid outlet.

[0043] The difference between this embodiment and the previous embodiment is that the driving component can also be a device in the prior art that can drive the cell tray 13 to move vertically up and down, such as a cylinder.

[0044] In a further embodiment, the bracket is also provided with a pull rod 11, which is fixedly connected to the injection rod 24 via a top plate. The tops of the multiple pull rods 11 are connected by a crossbar, so that multiple pull rods 11 can be moved simultaneously by pulling the crossbar to achieve quantitative injection of liquid into multiple cells.

[0045] In a further embodiment: a sealing head 26 is provided on the outside of the liquid outlet, and a discharge port is provided at the bottom of the sealing head 26;

[0046] Ensure that the liquid nozzle at the bottom of the injection cylinder is sealed to the interface of the battery cell injection hole to prevent electrolyte and vacuum leakage.

[0047] In a further embodiment, the snap-fit ​​component 3 includes two semi-circular clamps 31, which are symmetrically arranged through the support rod 12. Each of the two semi-circular clamps 31 has a groove 32 on its opposite side. The outer wall of the injection cylinder 2 has a protrusion 22 that matches the groove 32. The joint of the two semi-circular clamps 31 has a horizontal extension, which can be locked with bolts to achieve circular closure of the semi-circular clamps 31.

[0048] That is, the two circular clamps 31 are clamped to the outside of the injection cylinder 2, and the two circular clamps can be locked with bolts for secondary positioning, further ensuring the stable setting of the injection cylinder.

[0049] In a further embodiment, a boss 15 is also included. The boss 15 is sleeved and fixed on the outside of the support rod 12 and located above the elastic element. The top of the boss 15 extends out of the positioning hole of the cell tray 13 and the bottom abuts against the lower end face of the cell tray 13.

[0050] That is, the cell tray 13 is fixed to the support rod 12 by the boss 15, which further ensures the stability of the cell tray on the bracket.

[0051] In a further embodiment, the bottom of the injection cylinder 2 is conical;

[0052] By setting the bottom of the injection cylinder 2 into a cone shape, the electrolyte can flow smoothly into the battery cell when it enters the injection cylinder 2, which greatly avoids electrolyte residue at the bottom of the injection cylinder 2, and further affects the quantitative injection accuracy of electrolyte in the battery cell.

[0053] In a further embodiment, the bottom of the injection rod 24 is provided with a conical protrusion, and a groove is provided above the conical protrusion. The sealing ring 25 is engaged with the conical protrusion through the groove.

[0054] That is, by setting the outer side of the conical protrusion of the sealing ring, the bottom cavity of the injection cylinder 2 is kept in a sealed state, which further ensures the quantitative accuracy of the electrolyte.

[0055] In a further embodiment, the storage tank 5 is made of transparent material and has capacity scale lines marked on its outer wall; that is, when the required quantitative amount of electrolyte is added to the storage tank, the amount of electrolyte injected can be determined by the capacity scale on the storage tank. At the same time, the amount of electrolyte injected into the battery cell can also be determined by whether there is any remaining electrolyte in the storage tank.

[0056] In this embodiment, the side wall of the injection cylinder 2 is provided with a second valve, and the injection nozzle is also provided with a third valve. The second valve is used to discharge gas inside the cylinder, and the third valve is used to control the connection and disconnection between the injection cylinder and the battery cell.

[0057] First, add a measured amount of electrolyte to the storage tank 5 and ensure the first valve is closed. Then, use the injection rod 24 to purge the gas from the injection cylinder 2. Next, connect the cell injection port to the lower nozzle and open the third valve. Pull the injection rod 24 upward to put the cell under negative pressure and close the third valve. Then, open the second valve to purge the gas from the injection cylinder and close it. Pull the injection rod 24 upward again and open the first valve to allow all the liquid in the storage tank to flow into the injection cylinder 2 due to the negative pressure. Finally, open the third valve to inject all the electrolyte into the cell.

[0058] In a further embodiment, the injection cylinder is made of a transparent material and has capacity graduation lines marked on its outer wall;

[0059] By using a transparent injection tube, a volume slightly larger than the required electrolyte volume can be drawn from the battery cell during gas extraction, and this mark can be made. After the air is expelled, the injection rod is pulled back to this mark, and then the electrolyte in the storage tank is drawn into the injection tube and injected into the battery cell. In other words, by drawing a volume slightly larger than the required electrolyte volume, even after a fixed amount of electrolyte has been injected, the remaining air can be injected to push any electrolyte remaining on the tube wall back into the battery cell, further improving the accuracy of the quantitative electrolyte injection into the battery cell.

[0060] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A battery cell liquid injection device, characterized in that, include: A bracket (1) is provided with a battery cell tray (13) and an injection cylinder (2) arranged sequentially from bottom to top. The vertical distance between the battery cell tray (13) and the injection cylinder (2) is adjustable. An injection rod (24) is slidably arranged inside the injection cylinder (2) and a liquid nozzle is provided at the bottom. It also includes a storage tank (5), which is connected to the injection cylinder (2) via a connecting pipe to provide a certain amount of electrolyte to the battery cell; the side wall of the injection cylinder (2) is also provided with a first valve (6), which is used to control the connection and disconnection between the injection cylinder (2) and the storage tank (5).

2. The cell electrolyte injection device according to claim 1, characterized in that, The cell tray (13) is slidably mounted on the bracket (1) and has a driving component at the bottom. The driving component drives the cell tray (13) to rise to the cell injection port and communicate with the lower nozzle.

3. The cell electrolyte injection device according to claim 2, characterized in that, The bracket (1) is connected to the top plate and the bottom plate. Multiple support rods (12) are provided between the top plate and the bottom plate. The driving component is an elastic component and is sleeved on the support rods (12). The elastic component (4) is located between the cell tray (13) and the bottom plate.

4. The cell electrolyte injection device according to claim 1, characterized in that, The external part of the liquid outlet is provided with a sealing head (26), and the bottom of the sealing head (26) is provided with a discharge port.

5. The cell electrolyte injection device according to claim 1, characterized in that, The bracket (1) is also provided with a snap-fit ​​component (3), which includes two opposing semi-circular clamps (31). The two semi-circular clamps (31) have a groove (32) on one side opposite to each other. The outer wall of the injection cylinder (2) has a protrusion (22) that matches the groove (32). The two semi-circular clamps (31) can be detached and fixed.

6. The cell electrolyte injection device according to claim 1, characterized in that, The bottom of the injection cylinder (2) is conical.

7. The cell electrolyte injection device according to claim 1, characterized in that, The bottom of the injection rod (24) is provided with a conical protrusion, and a sealing ring (25) is sleeved on the outside of the conical protrusion.

8. The cell electrolyte injection device according to claim 1, characterized in that, The liquid storage tank (5) is made of transparent material and has capacity markings on its outer wall.

9. The cell electrolyte injection device according to claim 1, characterized in that, The side wall of the injection cylinder (2) is provided with a second valve, and the injection nozzle is also provided with a third valve. The second valve is used to discharge the gas extracted from the cylinder, and the third valve is used to control the connection and disconnection between the injection cylinder and the battery cell.

10. The cell electrolyte injection device according to claim 1, characterized in that, The injection cylinder (2) is made of transparent material and has capacity markings on its outer wall.

Images