Liquid injection device

Abstract

The application provides a liquid injection device, comprising: a liquid injection nozzle assembly, the liquid injection nozzle assembly having a liquid injection position and a circulation position, the liquid injection nozzle assembly being movably arranged between the liquid injection position and the circulation position; a collection component arranged at the side of the liquid injection nozzle assembly, the liquid injection nozzle assembly being communicated with the collection component so that the liquid injection nozzle assembly is in the circulation position; and a liquid storage component, the liquid storage component being respectively communicated with a liquid outlet of the collection component and the liquid injection nozzle assembly, and an electrolyte circulation loop being formed among the liquid injection nozzle assembly, the collection component and the liquid storage component when the liquid injection nozzle assembly is in the circulation position. The application solves the problem that the liquid injection device in the prior art needs to discharge the remaining electrolyte when performing a liquid supplementing process, thereby causing resource waste and reducing the liquid supplementing efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more specifically, to a liquid injection device. Background Technology

[0002] In the lithium-ion battery production process, electrolyte needs to be injected into the cell to form an electrolyte environment inside the cell, activate the battery materials, and ensure battery performance.

[0003] In existing battery cell electrolyte filling equipment, when a battery cell needs to be replenished, the time when the battery cell needs replenishment is uncertain, and the storage time of the electrolyte in the replenishment pipeline cannot be determined. Therefore, it is impossible to guarantee whether the electrolyte quality is up to standard. Thus, it is necessary to manually drain the electrolyte in advance to ensure that there are no air bubbles in the pipeline and that the electrolyte is the freshest electrolyte. Only after confirming that the battery cell needs to be replenished can it be placed on the weighing platform and scanned.

[0004] However, the above-mentioned electrolyte replenishment method requires the discharge of some electrolyte, resulting in resource waste and wasted time for manual drainage, thus reducing the efficiency of electrolyte replenishment. Summary of the Invention

[0005] The main objective of this invention is to provide a liquid injection device to solve the problem that existing liquid injection devices need to drain the remaining electrolyte during the replenishment process, which leads to resource waste and reduced replenishment efficiency.

[0006] To achieve the above objectives, according to one aspect of the present invention, a liquid injection device is provided, comprising: a liquid injection nozzle assembly having an injection position and a circulation position, the liquid injection nozzle assembly being movably disposed between the injection position and the circulation position; a collection component disposed to the side of the liquid injection nozzle assembly, the liquid injection nozzle assembly being in communication with the collection component to place the liquid injection nozzle assembly in the circulation position; and a liquid storage component having its outlet in communication with the liquid collection component and the liquid injection nozzle assembly respectively, wherein when the liquid injection nozzle assembly is in the circulation position, an electrolyte circulation loop is formed between the liquid injection nozzle assembly, the collection component, and the liquid storage component.

[0007] Furthermore, the electrolyte injection device also includes: a buffer component, disposed between the storage component and the collection component, wherein the buffer component is connected to both the storage component and the collection component; and a level detection component, disposed within the buffer component, for detecting the electrolyte level within the buffer component.

[0008] Furthermore, when the injection nozzle assembly is in the circulation position, the electrolyte in the liquid storage component is supplied to the injection nozzle assembly at predetermined intervals, and the electrolyte in the injection nozzle assembly flows into the buffer component for pre-storage.

[0009] Furthermore, the liquid injection device also includes: a first pipe fitting, the two ends of which are respectively connected to a buffer component and a liquid storage component; a first control valve, which is installed on the first pipe fitting and is signal-connected to a liquid level detection component. When the liquid level detection component detects that the liquid level of the electrolyte reaches a set threshold, it controls the first control valve to open, so that the first pipe fitting is open.

[0010] Furthermore, the liquid injection device also includes: a defoaming component, disposed between the buffer component and the liquid storage component, wherein the defoaming component is connected to both the buffer component and the liquid storage component; and a first air extraction component, connected to the defoaming component, which extracts air from the interior of the defoaming component.

[0011] Furthermore, the first pipe fitting includes: a first pipe section, with its two ends connected to a buffer component and a defoaming component respectively, and a first control valve disposed on the first pipe section; and a second pipe section, with its two ends connected to a defoaming component and a liquid storage component respectively, and a second control valve disposed on the second pipe section, through which the on / off state of the second pipe section is controlled.

[0012] Furthermore, the injection nozzle assembly includes: an injection nozzle body, the end of which is provided with a guide end face, at least a portion of which is a tapered surface; a carrying channel is provided on the collecting component, at least a portion of which is inserted into the carrying channel to place the injection nozzle body in a circulating position; the guide end face is in contact with the channel wall of the carrying channel.

[0013] Furthermore, the injection device also includes a sealing component, which is disposed on the injection nozzle body or the collection component, and the sealing component is respectively attached to the injection nozzle body and the collection component so that the injection nozzle body is in the circulation position.

[0014] Furthermore, a retaining ring is provided on the injection nozzle body, and the retaining ring surrounds the injection nozzle body; a contact platform is provided on the collection component, and at least a portion of the retaining ring is in contact with the contact platform; the sealing component includes a first sealing element and a second sealing element, the first sealing element is provided on the contact platform, and the second sealing element is provided in the carrying channel.

[0015] Furthermore, the liquid injection device also includes: a support platform, on which the injection nozzle assembly and the collection component are respectively disposed, and the liquid storage component is disposed below the support platform; and a drive assembly disposed on the support platform, wherein the injection nozzle assembly is connected to the drive assembly and the drive assembly drives the injection nozzle assembly to move between the injection position and the circulation position.

[0016] According to the technical solution of the present invention, the liquid injection device includes a liquid injection nozzle assembly, a collecting component, and a liquid storage component. The liquid injection nozzle assembly has an injection position and a circulation position, and is movably disposed between the injection position and the circulation position. The collecting component is disposed on the side of the liquid injection nozzle assembly, and the liquid injection nozzle assembly is connected to the collecting component so that the liquid injection nozzle assembly is in the circulation position. The liquid storage component and the outlet of the collecting component are respectively connected to the liquid injection nozzle assembly, the collecting component, and the liquid storage component to form an electrolyte circulation loop between the liquid injection nozzle assembly, the collecting component, and the liquid storage component. After the electrolyte injection nozzle assembly completes the electrolyte injection into the battery cell, it moves to the circulation position, where it connects with and is linked to the collection component. At this point, the electrolyte remaining in the nozzle assembly is fed into the collection component and then flows into the storage component. The electrolyte circulates between the nozzle assembly, the collection component, and the storage component, thus preventing the electrolyte from remaining in the nozzle assembly for too long, which could lead to contamination and compromised quality. This continuous circulation ensures that the electrolyte in the nozzle assembly maintains its normal quality. Therefore, when refilling, simply stop the electrolyte circulation and connect the nozzle assembly directly to the injection port on the battery cell. There is no residual electrolyte in the nozzle assembly, eliminating the need for electrolyte draining. This not only improves replenishment and injection efficiency but also prevents electrolyte waste. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A first-view structural schematic diagram of the liquid injection device according to the present invention is shown;

[0019] Figure 2 A schematic diagram of the electrolyte circulation loop in the injection device according to the present invention is shown;

[0020] Figure 3 A second-view structural schematic diagram of the liquid injection device according to the present invention is shown;

[0021] Figure 4 A top view of the injection device according to the present invention is shown;

[0022] Figure 5 A schematic diagram showing the fit between the injection nozzle body and the collection component in the injection device according to the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 1. Injection nozzle assembly; 2. Collection component; 3. Liquid storage component; 4. Buffer component; 40. Liquid level detection component; 41. Third control valve; 42. Second suction component; 5. First pipe fitting; 50. First control valve; 6. Defoaming component; 60. First suction component; 51. First pipe section; 52. Second pipe section; 520. Second control valve; 10. Injection nozzle body; 11. Guide end face; 20. Bearing channel; 21. Sealing component; 22. Contact platform; 12. Snap ring; 210. First seal; 211. Second seal; 8. Support platform; 80. Drive assembly; 81. First drive module; 82. Second drive module; 13. Liquid storage cup; 100. Battery cell; 83. First start button; 84. Second start button; 85. Barcode scanning component; 86. Weighing platform; 87. Display component. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] As mentioned in the background section, in existing electrolyte injection devices for battery cells, the electrolyte is introduced into the cell through a nozzle that connects to the injection port on the cell. After the initial injection, a second injection may occur. Between the first and second injections, or between injections of two cells, some electrolyte may remain in the nozzle. This retention of electrolyte in the air can lead to contamination, and prolonged retention makes it impossible to guarantee the quality of the remaining electrolyte before a second injection or before injecting the next cell. Therefore, before replenishing the electrolyte, the battery cell needs to be manually placed onto the replenishment platform using an empty aluminum shell (without a welded cover), and the draining mode should be set via a touchscreen. After determining the electrolyte volume and drainage frequency, press the start button to drain any potentially expired electrolyte remaining in the tube. Manually clean the injection nozzle connected to the battery cell injection port below the injection buffer cup. Pour the drained liquid into the waste liquid recycling bin. After drainage, manually activate the replenishment mode, manually place the replenished battery cell onto the weighing platform, scan the code to obtain information and the required replenishment volume, then manually move the battery cell to the left replenishment station receiving platform, activate the replenishment button, and after replenishment, remove the replenished battery cell and place it back onto the weighing platform. Update the replenishment data and save it to the host computer. It is necessary to drain the remaining electrolyte, and the amount drained cannot be determined. This not only wastes electrolyte but also wastes injection time and reduces replenishment efficiency. Therefore, to address the aforementioned technical problems, the liquid injection device provided in this application includes a liquid injection nozzle assembly 1 with an injection position and a circulation position. When the liquid injection nozzle assembly 1 is in the injection position, it connects with the injection port on the battery cell, and the electrolyte is supplied to the liquid injection nozzle assembly 1 by the liquid storage component 3 to inject electrolyte into the battery cell. After the injection is completed, the liquid injection nozzle assembly 1 moves to the circulation position, connects with and is linked to the collection component 2, and the collection component 2 is connected to the liquid storage component 3. In this way, an electrolyte circulation loop is formed between the liquid injection nozzle assembly 1, the collection component 2, and the liquid storage component 3, allowing the electrolyte to circulate within the loop. Compared with the prior art, in the liquid injection device of this application, the electrolyte in the entire liquid supply system is always kept fresh. When replenishment or injection is required, it is only necessary to stop the circulation and move the liquid injection nozzle assembly 1 to the injection position to directly inject electrolyte without the need to discharge the remaining electrolyte. This not only improves the efficiency of replenishment and injection but also avoids the waste of electrolyte.

[0027] Please refer to Figures 1 to 5 The present invention provides an electrolyte injection device, comprising: an injection nozzle assembly 1 having an injection position and a circulation position, the injection nozzle assembly 1 being movably disposed between the injection position and the circulation position; a collection component 2 disposed on the side of the injection nozzle assembly 1, the injection nozzle assembly 1 being connected to the collection component 2 so that the injection nozzle assembly 1 is in the circulation position; and a liquid storage component 3 being connected to the outlet of the collection component 2 and the injection nozzle assembly 1 respectively, so as to form an electrolyte circulation loop between the injection nozzle assembly 1, the collection component 2 and the liquid storage component 3.

[0028] The liquid injection device provided in this application includes a liquid injection nozzle assembly 1, a collection component 2, and a liquid storage component 3. The liquid injection nozzle assembly 1 has an injection position and a circulation position, and is movably disposed between the injection position and the circulation position. The collection component 2 is disposed on the side of the liquid injection nozzle assembly 1, and the liquid injection nozzle assembly 1 is connected to the collection component 2 so that the liquid injection nozzle assembly 1 is in the circulation position. The liquid storage component 3 is connected to the outlet of the collection component 2 and the liquid injection nozzle assembly 1 respectively, so as to form an electrolyte circulation loop between the liquid injection nozzle assembly 1, the collection component 2, and the liquid storage component 3. After the electrolyte injection nozzle assembly 1 completes the electrolyte injection into the battery cell, it moves to the circulation position. The electrolyte injection nozzle assembly 1 connects with and is linked to the collection component 2. At this time, the electrolyte remaining in the electrolyte injection nozzle assembly 1 is input into the collection component 2 and then flows into the storage component 3. The electrolyte circulates between the electrolyte injection nozzle assembly 1, the collection component 2, and the storage component 3, thus avoiding the situation where the electrolyte remains in the electrolyte injection nozzle assembly 1 for too long, which could easily lead to contamination and compromise its quality. During the continuous circulation of the electrolyte, the electrolyte in the electrolyte injection nozzle assembly 1 always maintains its normal quality. Therefore, when continuing to inject electrolyte, it is only necessary to stop the electrolyte circulation and connect the electrolyte injection nozzle assembly 1 directly to the injection port on the battery cell. There is no residual electrolyte in the electrolyte injection nozzle assembly 1, and there is no need to perform electrolyte discharge for the electrolyte injection nozzle assembly 1. This not only improves the efficiency of electrolyte replenishment and injection but also avoids electrolyte waste.

[0029] Specifically, the electrolyte injection device also includes: a buffer component 4, disposed between the storage component 3 and the collection component 2, and the buffer component 4 is connected to both the storage component 3 and the collection component 2; and a level detection component 40, disposed within the buffer component 4, for detecting the electrolyte level within the buffer component 4. To increase the electrolyte storage capacity and ensure electrolyte quality, the buffer component 4 is provided. The electrolyte in the injection nozzle assembly 1 first flows into the buffer component 4 for storage. When the level in the buffer component 4 reaches its upper limit, the electrolyte in the buffer component 4 is controlled to flow into the storage component 3.

[0030] Preferably, the buffer component 4 is a buffer tank, which is connected to a negative pressure pump. The buffer tank is located below the support platform 8 and is correspondingly set with the collection component 2, so that the electrolyte in the collection component 2 flows into the buffer tank under its own weight without the need for external power transmission. In order to avoid the accumulation of air bubbles generated by the electrolyte during the flow process in the buffer tank, a negative pressure pump is set on the buffer tank. The air pressure in the buffer tank is adjusted by the negative pressure pump, thereby eliminating the air bubbles in the buffer tank.

[0031] In one embodiment provided in this application, when the injection nozzle assembly 1 is in the circulation position, the electrolyte in the storage component 3 is supplied to the injection nozzle assembly 1 at predetermined intervals, and the electrolyte in the injection nozzle assembly 1 flows into the buffer component 4 for pre-storage. This setting can avoid the problem of excessively rapid electrolyte input in the buffer component 4 and frequent switching of various control valves in the entire system caused by uninterrupted electrolyte circulation. Specifically, the discharge volume and discharge frequency in the injection nozzle assembly 1 are set. For example, the injection nozzle assembly 1 inputs a predetermined flow rate of electrolyte into the buffer component 4 every 30 seconds. When the input time reaches 3 to 5 minutes, the electrolyte in the buffer component 4 has stored a certain capacity, and the connection between the buffer component 4 and the storage component 3 is controlled to enter the next circulation process.

[0032] In this embodiment, a filter element is provided between the collecting component 2 and the buffer component 4. The electrolyte in the collecting component 2 is filtered by the filter element and then flows into the buffer component 4 for storage. Preferably, the filter element is a filter membrane, which can filter out small particles, thereby ensuring the purity of the electrolyte and improving battery performance and lifespan. The collecting component 2 and the buffer component 4 are connected by a second pipe, and the filter membrane is detachably installed inside the second pipe. This facilitates the installation and removal of the filter membrane, allowing it to be replaced when its filtration efficiency decreases after prolonged use.

[0033] In another embodiment, a filter component is connected between the collecting component 2 and the buffer component 4. The filter component includes a connecting sleeve and a filter element. The two ends of the connecting sleeve are connected to the collecting component 2 and the buffer component 4, respectively. As the electrolyte flows through the connecting sleeve, it is filtered by the filter element.

[0034] Furthermore, in another embodiment provided in this application, such as Figure 2 As shown, the liquid injection device further includes: a first pipe fitting 5, with both ends of the first pipe fitting 5 connected to the buffer component 4 and the liquid storage component 3 respectively; and a first control valve 50, disposed on the first pipe fitting 5, which is signal-connected to the liquid level detection component 40. When the liquid level detection component 40 detects that the electrolyte level reaches a set threshold, it controls the first control valve 50 to open, thus opening the first pipe fitting 5. In this way, the liquid level detection component 40 detects the electrolyte level in the buffer component 4, and when the level reaches the set threshold, it transmits a signal to the first control valve 50, controlling the first control valve 50 to open, allowing the electrolyte in the buffer component 4 to flow into the liquid storage component 3 through the first pipe fitting 5. Preferably, the liquid level detection component 40 is a capacitive liquid level sensor or an ultrasonic liquid level gauge.

[0035] In practical implementation, the electrolyte injection device further includes: a defoaming component 6, disposed between the buffer component 4 and the liquid storage component 3, with the defoaming component 6 connected to both the buffer component 4 and the liquid storage component 3; and a first vacuum pump 60, connected to the defoaming component 6, which evacuates air from the interior of the defoaming component 6. By setting up the defoaming component 6, air bubbles generated during the flow of the electrolyte are eliminated, preventing any impact on the conductivity of the electrolyte. The first vacuum pump 60 is a vacuum pump, which eliminates air bubbles by controlling the pressure inside the defoaming component 6.

[0036] Furthermore, in one embodiment, the top of the buffer component 4 is connected to a third control valve 41. The buffer component 4 adopts a sealed tank structure. When the collecting component 2 introduces electrolyte into the buffer component 4, the third control valve 41 is used to discharge the gas inside the sealed tank to ensure smooth flow of the electrolyte. When the liquid in the buffer component 4 reaches a set threshold, the first control valve 50 opens, and the first suction component 60 operates, creating a negative pressure environment inside the defoaming component 6. At this time, the third control valve 41 is opened, and the electrolyte in the buffer component 4 flows into the defoaming component 6 using the pressure difference between the defoaming component 6 and the buffer component 4. In another embodiment, the top of the buffer component 4 is connected to a second suction component 42. The second suction component 42 extracts some of the gas inside the buffer component 4 to maintain a negative pressure environment, allowing the electrolyte in the collecting component 2 to flow into the buffer component 4. Preferably, the second suction component 42 is a vacuum pump.

[0037] Alternatively, a third control valve 41 and a second air extraction component 42 can be provided on the buffer component 4. In this case, the air pressure inside the buffer component 4 can be adjusted by the third control valve 41 or the second air extraction component 42. In addition, the second air extraction component 42 can be used to defoam the electrolyte inside the buffer component 4.

[0038] Preferably, the third control valve 41 is a pneumatic valve.

[0039] like Figure 2As shown, specifically, the first pipe fitting 5 includes a first pipe section 51 and a second pipe section 52. The two ends of the first pipe section 51 are connected to the buffer component 4 and the defoaming component 6, respectively. The two ends of the second pipe section 52 are connected to the liquid storage component 3 and the defoaming component 6, respectively. A first control valve 50 is installed on the first pipe section 51, and a second control valve 520 is installed on the second pipe section 52. The second control valve 520 controls the opening and closing of the second pipe section 52. During the defoaming process of the defoaming component 6, the second control valve 520 is closed to prevent the air pressure inside the defoaming component 6 from affecting the electrolyte in the liquid storage component 3. After defoaming is completed, the second control valve 520 is opened, and the electrolyte flows into the liquid storage component 3 for storage. Preferably, the first control valve 50 and the second control valve 520 are pneumatic valves. Pneumatic valves have a simple structure, are easy to maintain, and have reliable sealing performance, ensuring the sealing performance of the pipeline system.

[0040] In this application, the injection nozzle assembly 1 includes: an injection nozzle body 10, with a guide end face 11 at its end, at least a portion of which is tapered; a collection component 2 having a carrying channel 20, with at least a portion of the injection nozzle body 10 inserted into the carrying channel 20 to place the injection nozzle body 10 in a circulating position; and the guide end face 11 fitting against the channel wall of the carrying channel 20. By providing the guide end face 11, the injection nozzle body 10 can be smoothly inserted into the carrying channel 20, docking and communicating with the collection component 2. Setting at least a portion of the guide end face 11 as a tapered surface improves the fitting accuracy between the injection nozzle body 10 and the carrying channel 20.

[0041] Furthermore, the electrolyte injection device also includes a sealing component 21, which is disposed on the injection nozzle body 10 or the collection component 2. The sealing component 21 is respectively attached to the injection nozzle body 10 and the collection component 2 to keep the injection nozzle body 10 in a circulation position. By providing the sealing component 21, leakage of electrolyte can be avoided during the electrolyte output process of the injection nozzle body 10, ensuring the sealing between the injection nozzle body 10 and the carrying channel 20.

[0042] The injection nozzle body 10 is provided with a retaining ring 12, which surrounds the injection nozzle body 10. The collecting component 2 is provided with a contact platform 22, and at least a portion of the retaining ring 12 is in contact with the contact platform 22. The sealing component 21 includes a first sealing element 210 and a second sealing element 211. The first sealing element 210 is disposed on the contact platform 22, and the second sealing element 211 is disposed within the carrying channel 20. By providing the first sealing element 210 and the second sealing element 211, a double-layer seal is achieved when the injection nozzle body 10 is inserted into the carrying channel 20. Under the pressure of the injection nozzle body 10, the first sealing element 210 achieves a compression seal between the retaining ring 12 and the contact platform 22, while the second sealing element 211 achieves a compression seal between the injection nozzle body 10 and the carrying channel 20, ensuring that the electrolyte does not leak.

[0043] like Figure 1 and Figure 3 As shown, the injection device further includes: a support platform 8, with the injection nozzle assembly 1 and the collection component 2 respectively mounted on the support platform 8, and the liquid storage component 3 positioned below the support platform 8; and a drive assembly 80 mounted on the support platform 8, with the injection nozzle assembly 1 connected to the drive assembly 80, driving the injection nozzle assembly 1 to move between the injection position and the circulation position via the drive assembly 80. The drive assembly 80 includes a first drive module 81 and a second drive module 82. The injection nozzle assembly 1 is mounted on the first drive module 81, and the first drive module 81 is mounted on the second drive module 82. The second drive module 82 is movably mounted horizontally to drive the injection nozzle assembly 1 to move horizontally via the first drive module 81. The first drive module 81 is movably mounted vertically to drive the injection nozzle assembly 1 to move vertically, thereby enabling the injection nozzle assembly 1 to move between the injection position and the circulation position, while ensuring that the injection nozzle assembly 1 has sufficient downward pressure to press against the collection component 2.

[0044] In practical use, the support platform 8 is also equipped with a first start button 83, a second start button 84, a barcode scanning component 85, a weighing platform 86, and a display component 87. When the equipment is in normal production and no liquid replenishment is required, the touch screen is set to the electrolyte circulation and renewal mode. The first drive module 81 moves to the predetermined position, and the storage cup 13 and the injection nozzle body 10 are directly below the collection component 2. The second drive module 82 presses down to keep the injection nozzle body 10 and the collection component 2 pressed and sealed. In the electrolyte circulation and renewal mode, the injection pump automatically discharges liquid into the storage cup 13 at regular intervals and in quantitative amounts. Then, through the injection nozzle body 10 and the collection component 2, the discharged electrolyte flows into the recovery tank (buffer component 4). After one return is completed, according to the set discharge time, the injection pump connected to the storage component 3 will discharge liquid again, and the discharged electrolyte will flow back into the recovery tank, repeating the cycle to ensure that the electrolyte in the pipeline is in the freshest state. When the electrolyte level in the recovery tank reaches between the upper level and the upper limit a3, and the defoaming tank (defoaming component 6) starts vacuum defoaming, the equipment automatically opens the first control valve 50 of the recovery tank, and the electrolyte in the recovery tank is drawn back into the defoaming tank through vacuum. When the electrolyte level in the recovery tank reaches the lower level c3, the first control valve 50 is automatically closed, completing the electrolyte return of the recovery tank. If poor electrolyte injection occurs and the battery cell needs to be replenished, the touch screen switches to the replenishment mode, and the injection nozzle body 10 automatically moves to the replenishment position through the second drive module 82 and the first drive module 81, stopping directly above the battery cell 100. The battery cell is manually placed on the weighing platform 86, the battery cell code is manually scanned with the handheld barcode scanner 85, and then the second start button 84 is activated to calculate the required replenishment amount for the corresponding battery cell. The confirmation button is then clicked on the touch screen (display component 87). Manually move the replenished battery cell to position 100, and activate the first start button 83. The injection nozzle body 10 automatically descends and presses against the injection port of battery cell 100. The equipment completes automatic liquid injection, sealing test, and breathing-type liquid replenishment. After replenishment, the injection nozzle body 10 rises. After replenishment, the replenished battery cell is placed on the weighing platform 86 and weighed again to confirm the weight after replenishment. Confirm the weight and liquid volume of the replenished battery cell on the touch screen and click the confirmation button. The equipment automatically saves the latest data to the host computer. Repeat the above steps to complete the automatic replenishment of the replenished battery cell. After replenishment, switch to electrolyte circulation and renewal mode. The injection nozzle body 10 is then pressed against the drain collection component 2 by the second drive module 82 and the first drive module 81. Repeat the above steps to achieve continuous automatic electrolyte renewal.

[0045] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0046] The liquid injection device provided in this application includes a liquid injection nozzle assembly 1, a collection component 2, and a liquid storage component 3. The liquid injection nozzle assembly 1 has an injection position and a circulation position, and is movably disposed between the injection position and the circulation position. The collection component 2 is disposed on the side of the liquid injection nozzle assembly 1, and the liquid injection nozzle assembly 1 is connected to the collection component 2 so that the liquid injection nozzle assembly 1 is in the circulation position. The liquid storage component 3 is connected to the outlet of the collection component 2 and the liquid injection nozzle assembly 1 respectively, so as to form an electrolyte circulation loop between the liquid injection nozzle assembly 1, the collection component 2, and the liquid storage component 3. After the electrolyte injection nozzle assembly 1 completes the electrolyte injection into the battery cell, it moves to the circulation position. The electrolyte injection nozzle assembly 1 connects with and is linked to the collection component 2. At this time, the electrolyte remaining in the electrolyte injection nozzle assembly 1 is input into the collection component 2 and then flows into the storage component 3. The electrolyte circulates between the electrolyte injection nozzle assembly 1, the collection component 2, and the storage component 3, thus avoiding the situation where the electrolyte remains in the electrolyte injection nozzle assembly 1 for too long, which could easily lead to contamination and compromise its quality. During the continuous circulation of the electrolyte, the electrolyte in the electrolyte injection nozzle assembly 1 always maintains its normal quality. Therefore, when continuing to inject electrolyte, it is only necessary to stop the electrolyte circulation and connect the electrolyte injection nozzle assembly 1 directly to the injection port on the battery cell. There is no residual electrolyte in the electrolyte injection nozzle assembly 1, and there is no need to perform electrolyte discharge for the electrolyte injection nozzle assembly 1. This not only improves the efficiency of electrolyte replenishment and injection but also avoids electrolyte waste.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A liquid injection device, characterized in that, include: Injector assembly (1), the injector assembly (1) having an injection position and a circulation position, the injector assembly (1) being movably disposed between the injection position and the circulation position; A collection component (2) is disposed on the side of the injection nozzle assembly (1), the injection nozzle assembly (1) being in communication with the collection component (2) so that the injection nozzle assembly (1) is in the circulation position; The liquid storage component (3) is connected to the outlet of the collection component (2) and the injection nozzle assembly (1) respectively. When the injection nozzle assembly (1) is in the circulation position, an electrolyte circulation loop is formed between the injection nozzle assembly (1), the collection component (2) and the liquid storage component (3). The liquid injection device further includes: a buffer component (4), which is disposed between the liquid storage component (3) and the collection component (2), and the buffer component (4) is respectively connected to the liquid storage component (3) and the collection component (2); When the injection nozzle assembly (1) is in the circulation position, the electrolyte in the liquid storage component (3) is supplied to the injection nozzle assembly (1) at predetermined intervals, and the electrolyte in the injection nozzle assembly (1) flows into the buffer component (4) for pre-storage; the injection nozzle assembly (1) inputs a predetermined flow rate of electrolyte into the buffer component (4) every 30 seconds, and when the input time reaches 3 to 5 minutes, the buffer component (4) and the liquid storage component (3) are connected to enter the next cycle; The liquid injection device further includes: a first pipe fitting (5), the two ends of which are respectively connected to the buffer component (4) and the liquid storage component (3); a first control valve (50), which is disposed on the first pipe fitting (5); and a third control valve (41) is connected to the top of the buffer component (4). A defoaming component (6) is disposed between the buffer component (4) and the liquid storage component (3), and the defoaming component (6) is connected to the buffer component (4) and the liquid storage component (3) respectively; a first air extraction component (60) is connected to the defoaming component (6) and air is extracted from the inside of the defoaming component (6) through the first air extraction component (60); When the liquid in the buffer component (4) reaches the set threshold, the first control valve (50) opens and the first suction component (60) operates, making the defoaming component (6) a negative pressure environment. At this time, the third control valve (41) is opened, and the electrolyte in the buffer component (4) flows into the defoaming component (6) by utilizing the pressure difference between the defoaming component (6) and the buffer component (4). A filtering component is connected between the collecting component (2) and the buffer component (4).

2. The liquid injection device according to claim 1, characterized in that, The injection device also includes: A liquid level detection component (40) is disposed within the buffer component (4) and is used to detect the liquid level of the electrolyte within the buffer component (4).

3. The liquid injection device according to claim 2, characterized in that, The injection device also includes: The first control valve (50) is signal-connected to the liquid level detection component (40). When the liquid level detection component (40) detects that the liquid level of the electrolyte reaches a set threshold, it controls the first control valve (50) to open, so that the first pipe (5) is connected.

4. The liquid injection device according to claim 1, characterized in that, The first pipe fitting (5) includes: The first pipe section (51) is connected to the buffer component (4) and the defoaming component (6) at both ends, and the first control valve (50) is installed on the first pipe section (51). The second pipe section (52) is connected to the defoaming component (6) and the liquid storage component (3) at both ends. The second pipe section (52) is provided with a second control valve (520), which controls the opening and closing of the second pipe section (52).

5. The liquid injection device according to claim 1, characterized in that, The injection nozzle assembly (1) includes: an injection nozzle body (10), the end of which is provided with a guide end face (11), at least a portion of which is a tapered surface; The collecting component (2) is provided with a carrying channel (20), and at least a portion of the injection nozzle body (10) is inserted into the carrying channel (20) so that the injection nozzle body (10) is in a circulation position; The guide end face (11) is in contact with the channel wall of the bearing channel (20).

6. The liquid injection device according to claim 5, characterized in that, The injection device also includes: A sealing component (21) is disposed on the injection nozzle body (10) or the collection component (2). The sealing component (21) is respectively attached to the injection nozzle body (10) and the collection component (2) so that the injection nozzle body (10) is in the circulation position.

7. The liquid injection device according to claim 6, characterized in that, A retaining ring (12) is provided on the injection nozzle body (10), and the retaining ring (12) is arranged around the injection nozzle body (10); a contact platform (22) is provided on the collection component (2), and at least a portion of the retaining ring (12) is in contact with the contact platform (22); The sealing component (21) includes a first seal (210) and a second seal (211), the first seal (210) being disposed on the contact platform (22) and the second seal (211) being disposed within the bearing channel (20).

8. The liquid injection device according to claim 1, characterized in that, The injection device also includes: The support platform (8) is provided with the injection nozzle assembly (1) and the collection component (2) respectively, and the liquid storage component (3) is provided below the support platform (8). A drive assembly (80) is disposed on the support platform (8), and the injection nozzle assembly (1) is connected to the drive assembly (80). The drive assembly (80) drives the injection nozzle assembly (1) to move between the injection position and the circulation position.

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