Liquid injection system and liquid injection method

Abstract

The embodiment of the present application provides an injection system and an injection method. The injection system comprises a rotating device, an injection device, a liquid preparation mechanism, an upper and lower material station, a liquid supplement buffer station, a moving mechanism, a first weighing device, a second weighing device and a control device. The rotating device is provided with a battery placing position. The injection device is arranged on the battery placing position and is configured to inject the battery on the battery placing position. The liquid preparation mechanism is configured to prepare liquid for the injection device passing through a liquid preparation area of the liquid preparation mechanism. The upper and lower material station is configured to place a battery to be injected and a battery after injection. The liquid supplement buffer station is configured to buffer a battery to be supplemented with liquid. The moving mechanism is configured to move the battery. The first weighing device is configured to weigh the battery after injection. The second weighing device is configured to weigh the battery to be injected. The injection system provided by the embodiment of the present application can realize automatic liquid supplement of the battery and improve the automation degree of battery injection.

Description

[0001] This application is a divisional application of the invention patent application with the application date of April 16, 2024, the application number of 202410452923.4, and the invention name of "liquid injection system and liquid injection method". TECHNICAL FIELD

[0002] The present application relates to the technical field of battery production equipment, in particular to a liquid injection system and a liquid injection method. BACKGROUND

[0003] This section aims to provide background or context for the embodiments of the present application. The description herein is not admitted to be prior art merely because it is included in this section.

[0004] During the production process of a battery, processes such as liquid injection and sealing are usually required. The liquid injection process refers to injecting electrolyte into the interior of the battery through a liquid injection hole provided on the battery. In the related art, the liquid injection equipment has low automation degree, low production efficiency, and high labor cost. SUMMARY

[0005] Therefore, the embodiments of the present application aim to provide a liquid injection system and a liquid injection method, which can improve the automation degree and production efficiency, and reduce the labor cost.

[0006] To achieve the above objectives, a first aspect of this application provides a liquid injection system for injecting liquid into batteries, comprising: a rotary device having a plurality of battery placement positions arranged circumferentially and rotatably, the battery placement positions being used to place batteries, each battery placement position sequentially passing through an inlet / outlet position, a liquid preparation position, at least one static buffer position, and returning to the inlet / outlet position by rotational displacement; a liquid injection device, each of the battery placement positions being respectively equipped with the liquid injection device, the liquid injection device being configured to inject liquid into the batteries placed in the battery placement positions; and a liquid preparation mechanism disposed circumferentially outside the rotary device, the liquid preparation mechanism being... The device is configured to prepare electrolyte for the battery placement position located at the electrolyte preparation position; a loading / unloading station is located on the outer circumference of the rotary device, configured to place batteries to be injected and batteries after being injected; a electrolyte replenishment buffer station is configured to buffer batteries to be replenished; and a transfer mechanism is configured to move the injected batteries from the battery placement position located at the inlet / outlet position to the loading / unloading station, and move the batteries to be injected from the loading / unloading station to the battery placement position located at the outlet position, or move the batteries to be replenished from the electrolyte replenishment buffer station to the battery placement position located at the inlet / outlet position. The system includes: a battery placement position; a first weighing device configured to weigh the battery after electrolyte injection; a second weighing device configured to weigh the battery to be injected with electrolyte; a control device configured to control the second weighing device to weigh the battery to be injected with electrolyte, then control the transfer mechanism to move the battery to be injected with electrolyte from the loading / unloading station to the battery placement position at the inlet / outlet station, control the rotary device to rotate and shift the battery placement position, and control the electrolyte preparation mechanism to inject electrolyte into the battery placement position equipped with the electrolyte preparation device that has been moved to the electrolyte preparation position. The system prepares the electrolyte, controls the electrolyte injection device to inject electrolyte into the battery in the battery placement position before the battery rotation returns to the inlet / outlet position, controls the transfer mechanism to move the injected battery from the battery placement position to the loading / unloading station, controls the first weighing device to weigh the injected battery, and after the weighing, the battery to be replenished is transferred to the replenishment buffer station, further controls the transfer mechanism to move the battery to be replenished in the replenishment buffer station to the battery placement position located at the inlet / outlet position where no battery is placed.

[0007] Therefore, by controlling the transfer mechanism of the control equipment to move the batteries to be injected with electrolyte from the loading and unloading station to the battery placement position, or to move the batteries to be injected with electrolyte from the electrolyte replenishment buffer station to the battery placement position, the rotation device is controlled to rotate the battery placement position carrying the batteries, and the electrolyte preparation mechanism is controlled to prepare electrolyte for the injection device to achieve automatic electrolyte preparation. After automatic electrolyte preparation is completed, the injection device is controlled to complete the electrolyte injection of the batteries in the battery placement position before rotating back to the loading and unloading station, thereby achieving fully automatic electrolyte injection of batteries, improving the automation level of battery electrolyte injection, increasing production efficiency, and reducing labor costs. In addition, by setting up a first weighing device to weigh the batteries after electrolyte injection and transferring the weighed batteries to be injected with electrolyte to the electrolyte replenishment buffer station, the yield rate can be improved while the automatic electrolyte replenishment of batteries can be achieved, further improving the automation level of battery electrolyte injection.

[0008] In some embodiments, the liquid injection system includes a feeding detection device, and the control device is capable of controlling the feeding detection device to detect batteries passing through the detection area of ​​the feeding detection device. The feeding detection device includes a second weighing device, which is configured to weigh batteries passing through the weighing area of ​​the second weighing device. For the same battery, if the difference between the weight of the battery after liquid injection measured by the first weighing device and the weight of the battery to be injected measured by the second weighing device does not reach a specified amount, the control device controls the robot to transfer the battery to the liquid replenishment buffer station.

[0009] In this embodiment, by setting up a feeding detection device to detect the batteries passing through the detection area of ​​the feeding detection device, it is beneficial to promptly detect whether the batteries to be injected with electrolyte are qualified, thereby improving battery production efficiency. The second weighing device is used to automatically weigh the batteries, that is, to obtain the weight of the batteries before electrolyte injection, and then to weigh the batteries after electrolyte injection using the first weighing device. The same battery is weighed using the first and second weighing devices, and the weight of the battery before electrolyte injection obtained by the second weighing device is subtracted from the weight of the battery after electrolyte injection obtained by the first weighing device to obtain the amount of electrolyte injected into the battery, thereby confirming whether the amount of electrolyte injected into the battery meets the standard.

[0010] In some embodiments, the liquid injection system includes a robot, a feeding conveyor belt with a picking position and a discharging conveyor belt with a discharging position, the feeding detection device is disposed on one side of the feeding conveyor belt, and the control device is capable of controlling the robot to transfer qualified batteries from the picking position to the loading / unloading position, and to transfer the liquid-injected batteries from the loading / unloading position to the discharging position.

[0011] For example, the robot is a six-axis robot. Compared to coordinate axis loading and unloading, six-axis robots are more flexible and more stable and reliable during transfer. By setting up robots to transfer qualified batteries from the picking position to the loading and unloading position, and to transfer batteries that have been filled with electrolyte from the loading and unloading position to the unloading position, it is beneficial to realize automated machine operation and reduce labor costs.

[0012] In some embodiments, the feeding detection device further includes a first barcode scanning device, and the control device is capable of controlling the first barcode scanning device to scan the batteries passing through the scanning area of ​​the first barcode scanning device.

[0013] This device is used for automatic scanning of batteries, which helps to identify and bind battery information, enabling tracking and recording of the battery throughout the electrolyte filling process and improving the reliability of electrolyte filling.

[0014] In some embodiments, the feeding detection device includes a short-circuit testing device, and the control device is capable of controlling the short-circuit testing device to perform short-circuit testing on batteries passing through the test area of ​​the short-circuit testing device.

[0015] The short-circuit testing device is used to automatically test batteries for short circuits. This helps to identify batteries with internal short circuits before electrolyte filling, improves the problem of defective products flowing to the end consumer, and increases the yield of batteries.

[0016] In some embodiments, the liquid injection system includes a feeding buffer conveyor belt, and the control device is capable of controlling the robot to transfer batteries that fail the inspection by the feeding detection device to the feeding buffer conveyor belt.

[0017] The feeding buffer belt is used to buffer defective batteries, eliminating the need to stop the production line and preventing defective products from reaching the end consumer. This helps improve automation and production efficiency.

[0018] In some embodiments, the liquid injection system includes a feeding and pairing station, and the control device is capable of controlling the robot to transfer unqualified battery packs detected by the feeding detection device to the feeding and pairing station. The unqualified battery packs contain at least one unqualified battery. The control device is also capable of controlling the robot to transfer the unqualified batteries from the feeding and pairing station to the feeding buffer conveyor belt, and to transfer qualified batteries from the feeding and pairing station to the unloading and loading station.

[0019] In this embodiment, by setting up a feeding and matching station, when the robot picks up batteries, if there are defective products, the robot will transfer the battery pack containing the defective batteries to the feeding and matching station, and then put the defective products in the battery pack into the feeding buffer conveyor belt. When all the battery packs are qualified, the entire battery pack is placed into the liquid injection fixture. When the number of batteries at the feeding and matching station meets the number of batteries that the robot can pick up in a single operation, the robot will prioritize picking up the batteries from the matching mechanism and placing them into the liquid injection fixture. This helps to free up the feeding and matching station and improves the efficiency of the robot filling the liquid injection fixture.

[0020] In some embodiments, the liquid injection system includes a discharge detection device, which includes a first weighing device and a second barcode scanning device disposed on one side of the discharge conveyor belt. The control device is capable of controlling the second barcode scanning device to scan the batteries passing through the barcode scanning area of ​​the second barcode scanning device.

[0021] The second scanning device is used to automatically scan the battery after electrolyte injection, which helps to identify and bind the information of the battery after electrolyte injection, so as to realize the tracking and recording of the battery throughout the electrolyte injection process and improve the reliability of electrolyte injection.

[0022] In some embodiments, the liquid injection system includes a feeding buffer conveyor belt, and the control device is capable of controlling the robot to transfer batteries that fail the inspection by the feeding detection device to the feeding buffer conveyor belt.

[0023] The feeding buffer tape is used to buffer unqualified batteries after electrolyte filling, so that the production line does not need to be stopped and the defective products will not flow to the end. This helps to improve the level of automation and production efficiency.

[0024] In some embodiments, the liquid injection system includes a feeding and matching station, and the control device is capable of controlling the robot to transfer unqualified battery packs detected by the feeding detection device to the feeding and matching station. The unqualified battery packs contain at least one unqualified battery. The control device is capable of controlling the robot to transfer batteries requiring liquid replenishment from the feeding and matching station to the liquid replenishment buffer station, to transfer unqualified batteries other than those requiring liquid replenishment to the feeding buffer conveyor belt, and to transfer qualified batteries from the feeding and matching station to the feeding conveyor belt.

[0025] In this embodiment, by setting up a feeding and matching station, when the robot picks up batteries, if there are defective products, the robot will transfer the battery pack containing the defective batteries to the feeding and matching station, and transfer the batteries in the battery pack that need to be replenished to the replenishment buffer station. Then, the defective batteries in the battery pack other than those needing replenishment (e.g., products with poor barcode scanning or batteries with excessive liquid after filling) will be transferred to the feeding buffer conveyor belt. When the number of batteries at the feeding and matching station meets the robot's single-pickup quantity, the robot will prioritize picking up the batteries at the feeding and matching station and placing them into the feeding conveyor belt. This helps to free up the feeding and matching station and improves the robot's picking efficiency. Furthermore, when the number of batteries at the replenishment buffer station meets the robot's single-pickup quantity, the robot will prioritize picking up the batteries at the replenishment buffer station and placing them into the liquid filling fixture in the battery placement position.

[0026] In some embodiments, the liquid injection system includes a cleaning device disposed on one side of the feed conveyor belt, and the control device is capable of controlling the cleaning device to clean the battery passing through the cleaning area of ​​the cleaning device.

[0027] The control device can control the cleaning device to wipe the electrolyte inlet of the battery passing through the cleaning area of ​​the cleaning device, so as to remove electrolyte residues on the outside of the electrolyte inlet.

[0028] In some embodiments, the liquid injection system includes a liquid injection fixture configured to receive the battery to be injected or replenished, or the battery after liquid injection. The transfer mechanism is used to move the liquid injection fixture containing the battery to be injected or replenished to the battery placement position, or to move the liquid injection fixture containing the battery after liquid injection from the battery placement position to the loading / unloading station.

[0029] A battery filling clamp is a structure used to hold and position a battery. During the filling process, the clamp's receiving slot supports the battery, and different mechanisms within the filling system handle the battery differently. Different batteries may require different filling clamps; therefore, different filling clamps can be used to hold different types of batteries.

[0030] In some embodiments, the injection system includes at least two of the rotary devices.

[0031] This is beneficial for improving the electrolyte injection efficiency of batteries, and the two rotary devices can share the feeding belt, unloading belt, and robot, which reduces the number of parts and lowers costs while improving electrolyte injection efficiency.

[0032] In some embodiments, the rotary device includes at least two stationary buffer positions, each of which is spaced apart circumferentially along the rotary device.

[0033] This helps improve the battery electrolyte injection efficiency and increase production cycle time.

[0034] In some embodiments, the liquid injection system includes a residual liquid receiving mechanism disposed on the circumferential outer side of the rotary device. Each battery placement position is rotated and shifted sequentially through the inlet / outlet position, the liquid preparation position, at least one static buffer position, the residual liquid receiving position, and returns to the inlet / outlet position. The control device can control the residual liquid receiving mechanism to clean the residual electrolyte in the liquid injection cup of the liquid injection device for the battery placement position located at the residual liquid receiving position.

[0035] This can improve the problem of inaccurate electrolyte filling volume in the next round of batteries due to electrolyte residue in the filling cup. In addition, the residual electrolyte receiving mechanism can also be used to hold residual electrolyte, which can improve the problem of electrolyte dripping onto the outside of the residual electrolyte receiving mechanism and help maintain cleanliness and hygiene.

[0036] In some embodiments, the injection system includes at least two of the rotary devices, and the replenishment buffer station is located between the at least two rotary devices.

[0037] This allows the two rotary units to share a liquid replenishment and buffer station.

[0038] In some embodiments, the injection system includes at least two rotary devices, the robot is located between the at least two rotary devices and between the replenishment buffer station and the unloading conveyor belt; the arrangement direction of the loading conveyor belt and the unloading conveyor belt is the same as the arrangement direction of the at least two rotary devices, and the loading conveyor belt and the unloading conveyor belt are located on the same side of the at least two rotary devices.

[0039] This allows robots to transport materials along shorter paths and also facilitates the sharing of robots.

[0040] A second aspect of this application provides a liquid injection method applied to a liquid injection system for injecting liquid into batteries. The liquid injection system includes a control device, a rotary device, an injection device, a liquid preparation mechanism, loading and unloading stations, a liquid replenishment and buffer station, a transfer mechanism, a first weighing device, and a second weighing device. The rotary device is provided with multiple stationary battery placement positions arranged circumferentially and capable of rotational displacement. Each battery placement position is used to place batteries. Each battery placement position rotates and moves sequentially through an inlet / outlet station, a liquid preparation station, at least one stationary buffer station, and returns to the inlet / outlet station. The liquid injection method includes: the control device controlling the second weighing device to weigh the batteries to be injected; and the control device controlling the transfer mechanism to load and unload the batteries to be injected from the loading and unloading stations. The batteries to be replenished at the liquid replenishment buffer station are transferred to the battery placement position of the rotary device; the control device controls the rotary device to rotate the battery placement position, and in response to the battery to be injected or replenished moving to the liquid preparation position, the control device controls the liquid preparation mechanism to prepare liquid for the liquid injection device equipped at the battery placement position located in the liquid preparation position, and controls the liquid injection device to evacuate the battery; in response to the completion of liquid preparation, the control device controls the rotary device to rotate the battery placement position, and controls the liquid injection device to inject liquid into the battery before the battery placement position rotates back to the inlet / outlet position; in response to the completion of liquid injection, the control device controls the first weighing device to weigh the injected battery that has been moved out of the battery placement position, and transfers the weighed battery to be replenished to the liquid replenishment buffer station.

[0041] Therefore, by controlling the transfer mechanism of the control equipment to move the batteries to be injected with electrolyte from the loading and unloading station to the battery placement position, or by moving the batteries to be replenished with electrolyte from the replenishment buffer station to the battery placement position, the rotation device is controlled to rotate the battery placement position carrying the batteries, and the electrolyte preparation mechanism is controlled to prepare electrolyte for the injection device, thus achieving automatic electrolyte preparation. After automatic electrolyte preparation is completed, the injection device is controlled to inject electrolyte into the batteries in the battery placement position before the battery placement position returns to the loading and unloading position, thereby achieving fully automatic battery electrolyte injection, improving the automation level of battery electrolyte injection, increasing production efficiency, and reducing labor costs. On the other hand, by setting up a first weighing device to weigh the batteries after electrolyte injection and transferring the weighed batteries to be replenished with electrolyte to the replenishment buffer station, the yield rate can be improved while also achieving automatic battery electrolyte replenishment, further improving the automation level of battery electrolyte injection.

[0042] In some embodiments, the liquid injection system includes a feeding conveyor belt, a feeding buffer conveyor belt, and a feeding detection device disposed on one side of the feeding conveyor belt. Before the control device controls the transfer mechanism to transfer the battery to be injected at the loading / unloading station or to be replenished at the replenishment buffer station to the rotary device, the system includes:

[0043] The control device controls the feeding conveyor belt to transport the battery to be injected with liquid;

[0044] The control device controls the feeding detection device to detect the batteries passing through the detection area of ​​the feeding detection device, and transfers the qualified batteries to the loading and unloading station, and transfers the unqualified batteries to the feeding buffer conveyor belt.

[0045] In some embodiments, the liquid injection system includes a feeding and pairing station, wherein transferring the qualified batteries to the loading and unloading station and transferring the unqualified batteries to the feeding buffer conveyor belt includes:

[0046] The control equipment transfers battery packs that pass the inspection to the loading and unloading station, and transfers battery packs that fail the inspection to the loading and pairing station. The unqualified battery packs contain at least one unqualified battery.

[0047] The control device transfers the batteries that fail the inspection at the feeding and pairing station to the feeding buffer conveyor belt. If the number of batteries that pass the inspection at the feeding and pairing station reaches a preset number, the control device transfers the preset number of batteries to the loading and unloading station.

[0048] In some embodiments, the control device controls the feeding detection device to detect batteries passing through the detection area of ​​the feeding detection device, including:

[0049] The feeding and detection device includes a second weighing device, and the control device controls the second weighing device to weigh the batteries passing through the weighing area of ​​the second weighing device; and / or

[0050] The feeding detection device includes a short-circuit testing device, and the control device controls the short-circuit testing device to perform short-circuit tests on batteries passing through the testing area of ​​the short-circuit testing device; and / or,

[0051] The feeding and detection device includes a first barcode scanning device, and the control device controls the first barcode scanning device to scan the batteries passing through the barcode scanning area of ​​the first barcode scanning device. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of an injection system according to an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of the structure of an injection clamp according to an embodiment of this application;

[0054] Figure 3 A schematic diagram illustrating the implementation flow of an injection method provided in an embodiment of this application;

[0055] Figure 4This is a schematic diagram illustrating another implementation flow of the injection method provided in one embodiment of this application;

[0056] Figure 5 This is a schematic diagram illustrating another implementation process of the liquid injection method provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram illustrating another implementation of the liquid injection method provided in an embodiment of this application.

[0058] Explanation of reference numerals in the attached figures

[0059] 1. Rotary device; 1a. Battery placement position; 10a. Material inlet / outlet position; 10b. Liquid preparation position; 10c. Static buffer position; 10d. Residual liquid receiving position; 2. Liquid injection fixture; 2a. Container tank; 3. Liquid preparation mechanism; 4. Loading and unloading station; 5. Liquid replenishment buffer station; 6. Unloading detection device; 61. First weighing device; 62. Second barcode scanning device; 7. Loading detection device; 71. First barcode scanning device; 72. Second weighing device; 73. Short circuit test device; 8. Robot; 9. Loading conveyor belt; 9a. Material removal position; 11. Unloading conveyor belt; 11a. Unloading position; 12. Loading buffer conveyor belt; 13. Loading pairing station; 14. Unloading buffer conveyor belt; 15. Unloading pairing station; 16. Cleaning device; 17. Residual liquid receiving mechanism; 100. Liquid injection system; 200. Battery. Detailed Implementation

[0060] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0065] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0068] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0069] With the government's strong promotion of new energy vehicles, these vehicles have ushered in a golden opportunity for development. Vehicle safety and stability have always been top concerns. Therefore, improving the safety of new energy vehicles will be one of the key factors determining their rapid popularization. As a major component of the battery pack in new energy vehicles, improving the safety of the battery module is a crucial way to enhance the overall safety of the vehicle.

[0070] The batteries mentioned in the embodiments of this application are used to form a battery device, which includes one or more battery cells as a single physical module to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs. Batteries generally include a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0072] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrolyte acts as a conductor of ions between the positive and negative electrodes. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector and serves as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector and serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0073] The battery cell also includes an insulating film and a casing. The insulating film covers the outside of the electrode assembly, and the casing encapsulates the electrode assembly covered with the insulating film to form the battery cell. The insulating film can be Mylar film, and the casing can be an aluminum shell. After the electrode assembly is wound and formed, the Mylar film and casing are encapsulated through a Mylar film wrapping process and a casing insertion process. The Mylar film serves to seal and protect the electrode assembly, and it effectively insulates the electrode assembly and casing from each other, preventing internal short circuits within the battery cell. The casing provides protection.

[0074] Following the casing process, a liquid injection process typically involves injecting electrolyte into the casing. This liquid injection process is a crucial step in battery manufacturing, as its accuracy directly affects the cycle performance, safety, and consistency of lithium-ion batteries. However, current liquid injection equipment suffers from low automation, low production efficiency, and high labor costs. It should be noted that the battery in the liquid injection process can be in an intermediate state before it becomes the finished individual battery cell in a battery assembly.

[0075] To improve automation and production efficiency and reduce labor costs, please refer to [link / reference]. Figure 1 and Figure 2This application provides a liquid injection system for injecting liquid into a battery 200. The liquid injection system 100 includes a rotary device 1, an injection device, a liquid preparation mechanism 3, a loading / unloading station 4, a liquid replenishment buffer station 5, a transfer mechanism, a first weighing device 61, a second weighing device 72, and control equipment. The rotary device 1 is provided with multiple battery placement positions 1a, which are arranged circumferentially and can be rotated and moved. The battery placement positions 1a are used to place batteries 200. Each battery placement position 1a passes sequentially through an inlet / outlet station 10a, a liquid preparation station 10b, at least one static buffer station 10c, and returns to the inlet / outlet station 10a by rotating and moving. Each battery placement position 1a is equipped with an injection device configured to inject liquid into the battery 200 on the battery placement position 1a. A liquid preparation mechanism 3 is located on the outer side of the rotary device 1. The liquid preparation mechanism 3 is configured to prepare liquid for the liquid injection device (i.e., the liquid injection device passing through the liquid preparation area of ​​the liquid preparation mechanism 3) located at the liquid preparation position 1a. A loading / unloading station 4 is located on the outer side of the rotary device 1. The loading / unloading station 4 is configured to place batteries 200 to be injected and batteries 200 after injection. A liquid replenishment buffer station 5 is configured to buffer batteries 200 to be replenished. A transfer mechanism is configured to move batteries 200 after injection from the battery placement position 1a located at the inlet / outlet position 10a to the loading / unloading station 4, and to move batteries 200 to be injected from the loading / unloading station 4 to the battery placement position 1a located at the inlet / outlet position 10a, or to move batteries 200 to be replenished from the liquid replenishment buffer station 5 to the battery placement position 1a located at the inlet / outlet position 10a. A second weighing device 72 is configured to weigh the batteries 200 to be injected. The first weighing device 61 is configured to weigh the battery 200 after it has been injected with electrolyte. The control device is configured to control the second weighing device 72 to weigh the battery to be injected with electrolyte, and then control the transfer mechanism to move the battery 200 to be injected with electrolyte from the loading / unloading station 4 to the battery placement position 1a located at the inlet / outlet station 10a. The control device 1 is controlled to rotate and move the battery placement position 1a, and the electrolyte preparation mechanism 3 is controlled to prepare electrolyte for the injection device equipped at the battery placement position 1a that has been moved to the electrolyte preparation position 10b. The control device is controlled to inject electrolyte into the battery 200 at the battery placement position 1a before the battery placement position 1a rotates back to the inlet / outlet station 10a. The control equipment controls the transfer mechanism to move the injected battery 200, which has rotated back to the inlet / outlet position 10a, from the battery placement position 1a to the loading / unloading position 4. Then, the first weighing device 61 is controlled to weigh the injected battery 200. After weighing, the battery 200 to be replenished is transferred to the replenishment buffer position 5. The control equipment further controls the transfer mechanism to move the battery 200 to be replenished from the replenishment buffer position 5 to the battery placement position 1a, which is located at the inlet / outlet position 10a and has not yet been filled with batteries 200.

[0076] For example, the rotary device 1 is provided with at least two battery placement positions (stationary positions) 1a, each battery placement position 1a being arranged circumferentially around the rotary device 1. Each battery placement position 1a is configured to mount a liquid injection clamp 2 for accommodating a battery 200, allowing for vacuuming, stationary placement, and other steps on the battery 200 in the liquid injection clamp 2. Because the battery placement positions 1a are arranged circumferentially around the rotary device 1, the rotary device 1 can rotate to drive the liquid injection clamp 2 within the battery placement position 1a to move circumferentially around the rotary device 1, thereby scheduling the battery placement positions 1a to perform different steps and ultimately complete the liquid injection.

[0077] The rotary device 1 being provided with at least two battery placement positions 1a means that the number of battery placement positions 1a is two or more. For example, the number of battery placement positions 1a can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, etc.

[0078] By setting at least two battery placement positions 1a, while the loading and unloading station 4 is handling the feeding, unloading, electrolyte preparation, vacuuming, and settling of batteries 200, the electrolyte injection devices located at the other battery placement positions 1a can inject electrolyte into the batteries 200. For example, positive and negative pressure circulating electrolyte injection can be used, which is beneficial for the full absorption of electrolyte, saves time, and improves production efficiency. Here, for ease of explanation, the position of the battery placement position 1a when the batteries 200 can be fed or unloaded can be called the feeding / unloading position; the position of the battery placement position 1a when the electrolyte injection device on the battery placement position can perform electrolyte injection (including vacuuming) can be called the electrolyte preparation position; and the position that the battery placement position 1a rotates through after passing the electrolyte preparation position can be called the settling buffer position. It should be noted that the "multiple" mentioned in the embodiments of this application refers to two or more.

[0079] In other embodiments, the number of rotating devices 1 may be one.

[0080] In some embodiments, please refer to Figure 1 and Figure 2 The liquid injection system 100 includes a liquid injection clamp 2. The liquid injection clamp 2 is configured to hold a battery 200 to be injected or replenished with liquid. A transfer mechanism is used to move the liquid injection clamp 2, which holds the battery 200 to be injected or replenished, to the battery placement position 1a. The liquid injection clamp 2 can also hold a battery 200 after liquid injection, and is used to move the injected battery from the battery placement position to the loading / unloading station 4. The battery placement position 1a can be the location where the liquid injection clamp 2 is placed.

[0081] The liquid injection clamp 2 refers to the structure used to accommodate and position the battery 200. During the liquid injection process, the receiving groove 2a of the liquid injection clamp 2 is used to support the battery 200, and different mechanisms of the liquid injection system 100 perform different treatments on the battery 200. Different batteries 200 may require different liquid injection clamps 2, thus, different liquid injection clamps 2 can be used to support different types of batteries 200.

[0082] For example, the rotary device 1 includes a mounting bracket, a turntable rotatably mounted on the mounting bracket, and a drive member for driving the turntable to rotate. In some embodiments, the rotary device 1 is also referred to as a turret.

[0083] Here, the turntable is driven to rotate horizontally by a drive unit. The rotation direction of the turntable can be either counterclockwise or clockwise. The battery placement position 1a can be a position on the turntable where a battery can be placed (by placing the battery through the liquid injection clamp 2). The turntable is driven to rotate by the drive unit, so that the battery placement position 1a of the rotating device 1 rotates.

[0084] For example, the driving element is a motor.

[0085] For example, each battery placement position 1a is provided with a corresponding liquid injection device, which is used to inject liquid into the battery 200 on the corresponding battery placement position 1a. At this time, the battery placement position 1a is located in the liquid reserve position.

[0086] The electrolyte preparation mechanism 3 is configured to prepare electrolyte for the electrolyte injection device passing through the electrolyte preparation area of ​​the electrolyte preparation mechanism 3. For example, the control device controls the battery placement position 1a, where the battery 200 to be injected is placed, to rotate to the electrolyte preparation position. The electrolyte injection device corresponding to the battery placement position 1a is located in the electrolyte preparation area. The control device controls the electrolyte preparation mechanism 3 to inject a fixed amount of electrolyte into the electrolyte injection cup of the electrolyte injection device, which is then used to inject electrolyte into the battery 200. For example, the electrolyte injection device can utilize positive and negative pressure cyclic injection.

[0087] The loading and unloading station 4 is configured to place the battery 200 to be injected with liquid and the battery 200 after being injected with liquid. That is, the loading and unloading station 4 is used to place the liquid injection fixture 2. The liquid injection fixture 2 is used to hold the battery 200 to be injected with liquid or the battery 200 to be replenished with liquid, or to place the liquid injection fixture 2 to hold the battery 200 after being injected with liquid.

[0088] Optionally, the liquid injection system includes a discharge detection device 6, which is used to detect the battery 200 after liquid injection to determine whether the battery 200 is qualified.

[0089] Please see Figure 1The first weighing device 61 is configured to weigh the battery 200 after it has been injected with liquid, thereby confirming whether the amount of liquid injected into the battery 200 meets the standard. If the amount of liquid is too low, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5. If the amount of liquid is too high, the unqualified battery 200 is transferred to the unloading buffer conveyor belt 14. If the amount of liquid injected meets the standard, the qualified battery 200 is conveyed to the next process, thereby realizing the automatic liquid replenishment of the battery 200.

[0090] Optionally, the first weighing device 61 can be equipped in the unloading detection device 6. It should be noted that the specific structure of the first weighing device 61 is not limited here, as long as it can automatically weigh the battery 200.

[0091] The electrolyte injection system of this application embodiment, on the one hand, controls the transfer mechanism via a control device to move the battery 200 to be injected from the loading / unloading station 4 to the battery placement station 1a, or moves the battery 200 to be replenished from the replenishment buffer station 5 to the battery placement station 1a. Then, it controls the rotation device 1 to rotate and controls the liquid preparation mechanism 3 to prepare liquid for the injection device, thereby achieving automatic liquid preparation. After the automatic liquid preparation is completed, it controls the injection device to complete the injection of the battery 200 on the battery placement station 1a before rotating back to the loading / unloading station, thereby achieving fully automatic electrolyte injection of the battery 200, improving the automation level of battery 200 electrolyte injection, increasing production efficiency, and reducing labor costs. On the other hand, by setting a first weighing device 61 to weigh the battery 200 after electrolyte injection and transferring the weighed battery 200 to be replenished to the replenishment buffer station 5, the system can improve the yield rate and achieve automatic liquid replenishment of the battery 200, further improving the automation level of battery 200 electrolyte injection.

[0092] In some embodiments, please refer to Figure 1 and Figure 2 The liquid injection system 100 includes a robot 8, a feeding conveyor belt 9 with a picking position 9a, and a discharging conveyor belt 11 with a discharging position 11a. The control equipment can control the robot 8 to transfer qualified batteries 200 from the picking position 9a to the loading / unloading station 4, and to transfer the liquid-injected batteries 200 from the loading / unloading station 4 to the discharging position 11a.

[0093] It should be noted that the specific type and location of robot 8 are not limited here, as long as it can transfer qualified batteries 200 from picking position 9a to loading / unloading position 4, and transfer batteries 200 that have been filled with electrolyte from loading / unloading position 4 to unloading position 11a. Of course, robot 8 can also have other functions.

[0094] Here, the feeding belt 9 is used to feed the battery 200. For example, the feeding belt 9 includes a first end and a second end along the conveying direction. The first end of the feeding belt 9 is the feeding end, and the second end of the feeding belt 9 is the picking position 9a. The battery 200 to be injected with liquid enters from the feeding end, and the feeding belt 9 conveys the battery 200 to be injected with liquid to the picking position 9a.

[0095] Here, the feeding belt 11 is used to feed the battery 200. For example, the feeding belt 11 includes a first end and a second end along the conveying direction. The first end of the feeding belt 11 is the feeding position 11a, and the second end of the feeding belt 11 is the discharge end. The battery 200 after being filled with liquid enters from the feeding position 11a, and the feeding belt 11 conveys the battery 200 after being filled with liquid to the discharge end.

[0096] Please see Figure 1 and Figure 2 Robot 8 transfers qualified batteries 200 from picking position 9a to loading / unloading position 4, for example, transferring qualified batteries 200 from picking position 9a to liquid injection fixture 2 on loading / unloading position 4. It then transfers the liquid-injected batteries 200 from loading / unloading position 4 to unloading position 11a, for example, transferring the liquid-injected batteries 200 from loading / unloading position 4 to liquid injection fixture 2 on unloading position 11a.

[0097] For example, robot 8 is a six-axis robot. Compared to coordinate axis loading and unloading, six-axis robot 8 is more flexible and more stable and reliable during the transfer process. By setting up robot 8 to transfer qualified batteries 200 from picking position 9a to loading / unloading position 4, and to transfer batteries 200 after liquid filling from loading / unloading position 4 to unloading position 11a, it is beneficial to realize automated machine operation and reduce labor costs.

[0098] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding detection device 7 disposed on one side of the feeding conveyor belt 9. The control equipment can control the feeding detection device 7 to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7.

[0099] In this embodiment, by setting up a feeding detection device 7 to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7, it is beneficial to promptly detect whether the batteries 200 to be injected with liquid are qualified, thereby improving the production efficiency of the batteries 200.

[0100] In some embodiments, please refer to Figure 1 The feeding and detection device 7 includes a first scanning device 71. The control equipment can control the first scanning device 71 to scan the batteries 200 passing through the scanning area of ​​the first scanning device 71.

[0101] It should be noted that the specific type of the first scanning device 71 is not limited here. For example, it can be a barcode scanner, a camera, etc.

[0102] The first scanning device 71 is located on one side of the feeding conveyor belt 9, which facilitates scanning of the battery 200 passing through the scanning area of ​​the first scanning device 71.

[0103] In this embodiment, by setting a first scanning device 71 for automatically scanning the battery 200, it is beneficial to identify and bind the information of the battery 200, so as to realize the tracking and recording of the battery 200 throughout the liquid injection process and improve the reliability of liquid injection.

[0104] In some embodiments, please continue reading Figure 1 The feeding and detection device 7 includes a second weighing device 72. The control equipment can control the second weighing device 72 to weigh the batteries 200 passing through the weighing area of ​​the second weighing device 72.

[0105] It should be noted that the specific structure of the second weighing device 72 is not limited here, as long as it can automatically weigh the battery 200.

[0106] The second weighing device 72 is located on one side of the feeding conveyor belt 9, which facilitates the weighing of the battery 200 passing through the weighing area of ​​the second weighing device 72 and obtains the weight of the battery 200 before liquid injection.

[0107] In this embodiment, by setting a second weighing device 72 to automatically weigh the battery 200, the weight of the battery 200 before liquid injection can be obtained. Then, the first weighing device 61 weighs the battery 200 after liquid injection. The first weighing device 61 and the second weighing device 72 weigh the same battery 200, and the weight of the battery 200 before liquid injection obtained by the second weighing device 72 is subtracted from the weight of the battery 200 after liquid injection obtained by the first weighing device 61 to obtain the amount of liquid injected into the battery 200. This confirms whether the amount of liquid injected into the battery 200 meets the standard. If there is too little liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5. If there is too much liquid, the unqualified battery 200 is transferred to the unloading buffer conveyor belt 14. If the amount of liquid injected meets the standard, the qualified battery 200 is conveyed to the next process, thereby realizing automatic liquid replenishment of the battery 200, improving the reliability of liquid injection into the battery 200 and the yield rate of the battery 200. In addition, it can also realize automatic electrolyte replenishment of battery 200, further improving the automation level of electrolyte filling of battery 200.

[0108] In related technologies, batteries require a baking process before electrolyte injection. However, after baking, the electrode sheets become loose, and some batteries have internal short circuits. Since short-circuit tests are not performed before electrolyte injection, defective products may reach end-users. Batteries with internal short circuits cannot be identified after electrolyte injection; therefore, batteries with internal short circuits need to be identified before electrolyte injection.

[0109] In some embodiments, please refer to Figure 1 The feeding and testing device 7 includes a short-circuit testing device 73. The control equipment can control the short-circuit testing device 73 to perform short-circuit testing (high-pot, high-potential) on the batteries 200 passing through the test area of ​​the short-circuit testing device 73.

[0110] It should be noted that the specific structure of the short-circuit test device 73 is not limited here, as long as it can perform automatic short-circuit testing on the battery 200.

[0111] The short-circuit test device 73 is located on one side of the feeding conveyor belt 9, which facilitates short-circuit testing of the battery 200 passing through the test area of ​​the short-circuit test device 73.

[0112] In this embodiment, by setting up a short-circuit testing device 73 to automatically short-circuit test the battery 200, it is beneficial to promptly identify batteries 200 with internal short circuit problems before liquid injection, improve the problem of defective products flowing to the end, and increase the yield of battery 200.

[0113] For example, the first barcode scanning device 71, the second weighing device 72, and the short-circuit testing device 73 are arranged sequentially along the conveying direction of the feeding belt 9.

[0114] Of course, the first scanning device 71 and the second weighing device 72 can also be set at the same workstation. That is to say, the battery 200 can be scanned by the first scanning device 71 and weighed by the second weighing device 72 at the same workstation.

[0115] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding buffer belt 12, and the control equipment can control the robot 8 to transfer the unqualified batteries 200 after being detected by the feeding detection device 7 to the feeding buffer belt 12.

[0116] For example, a battery 200 that fails the test is a product with a faulty barcode or a battery 200 that has an internal short circuit problem.

[0117] The feeding buffer belt 12 can be set between the feeding belt 9 and the unloading belt 11.

[0118] In this embodiment, by setting up a feeding buffer belt 12 to buffer unqualified batteries 200, there is no need to stop the line for processing, and the problem of defective products flowing to the end is avoided, which is conducive to improving the degree of automation and production efficiency.

[0119] In some embodiments, please continue reading Figure 1 The liquid injection system 100 includes a loading and matching station 13. The control equipment can control the robot 8 to transfer the unqualified battery packs detected by the loading detection device 7 to the loading and matching station 13. The unqualified battery packs contain at least one unqualified battery 200. The control equipment can control the robot 8 to transfer the unqualified battery 200 on the loading and matching station 13 to the loading buffer conveyor belt 12, and to transfer the qualified battery 200 on the loading and matching station 13 to the unloading and loading station 4.

[0120] Understandably, since robot 8 can transfer multiple batteries at a time (e.g., 4, 5, 6, 7, 8, 9, 10, etc.), multiple batteries can be grouped together, which facilitates robot 8's grasping and transfer.

[0121] In this embodiment, by setting up a feeding and matching station 13, when the robot 8 picks up the battery 200, if there are unqualified batteries 200 in the battery pack, the robot 8 transfers the unqualified battery pack to the feeding and matching station 13, and then puts the unqualified batteries 200 in the battery pack into the feeding buffer pull belt 12. When all the battery packs are qualified, the entire battery pack is put into the liquid injection fixture 2. When the number of batteries 200 on the feeding and matching station 13 meets the number of batteries that the robot 8 can pick up in a single operation, the robot 8 prioritizes picking up the batteries 200 on the matching mechanism and putting them into the liquid injection fixture 2. This helps to free up the feeding and matching station 13 and improves the efficiency of the robot 8 in filling the liquid injection fixture 2.

[0122] Of course, in other embodiments, when there are unqualified batteries 200 in the battery pack, the robot 8 puts the unqualified batteries 200 in the battery pack onto the loading buffer conveyor belt 12, and transfers the qualified batteries 200 on the loading and matching station 13 to the loading and unloading station 4, without waiting for the number of batteries 200 on the loading and matching station 13 to meet the number of batteries that the robot 8 can grab in a single operation before grabbing them.

[0123] In some embodiments, please continue reading Figure 1 The liquid injection system includes a discharge detection device 6, which includes the aforementioned first weighing device 61 and a second barcode scanning device 62 disposed on one side of the discharge conveyor belt 11. The control equipment can control the second barcode scanning device 62 to scan the batteries 200 passing through the scanning area of ​​the second barcode scanning device 62.

[0124] It should be noted that the specific type of the second scanning device 62 is not limited here. For example, it can be a barcode scanner, a camera, etc.

[0125] The first weighing device 61 and the second scanning device 62 are located on one side of the feeding conveyor belt 11, which is conducive to weighing the batteries 200 passing through the weighing area during the feeding process and scanning the batteries 200 passing through the scanning area of ​​the second scanning device 62.

[0126] In this embodiment, by setting a second scanning device 62, the battery 200 after liquid injection is automatically scanned, which is beneficial to identify and bind the information of the battery 200 after liquid injection, so as to realize the tracking and recording of the battery 200 throughout the liquid injection process and improve the reliability of liquid injection.

[0127] In some embodiments, please continue reading Figure 1 The liquid injection system 100 includes a feeding buffer belt 14, and the control equipment can control the robot 8 to transfer the unqualified batteries 200 after being detected by the feeding detection device 6 to the feeding buffer belt 14.

[0128] The feeding detection device 6 is used to detect the battery 200 after liquid injection.

[0129] For example, batteries 200 that fail the inspection by the feeding detection device 6 may be products with poor barcode scanning or batteries 200 with excessive liquid after filling.

[0130] In this embodiment, by setting up a feeding buffer belt 14, unqualified batteries 200 after liquid filling are buffered, so that the production line does not need to be stopped and the defective products will not flow to the end, which is conducive to improving the degree of automation and production efficiency.

[0131] In some embodiments, please continue reading Figure 1 The electrolyte filling system 100 includes a feeding and matching station 15. The control equipment can control the robot 8 to transfer the unqualified battery packs that have been detected by the feeding detection device 6 to the feeding and matching station 15. The unqualified battery packs contain at least one unqualified battery 200. The control equipment can control the robot 8 to transfer the batteries 200 that need to be replenished at the feeding and matching station 15 to the replenishment buffer station 5, transfer the unqualified batteries 200 other than those needing to be replenished to the feeding buffer conveyor belt 14, and transfer the qualified batteries 200 at the feeding and matching station 15 to the feeding conveyor belt 11.

[0132] In this embodiment, by setting up a feeding and matching station 15, when the robot 8 picks up a battery 200, if a battery pack contains defective batteries 200, the robot 8 will transfer the defective battery pack to the feeding and matching station 15, and transfer the batteries 200 in the battery pack that need to be replenished to the replenishment buffer station 5. Then, the defective batteries 200 in the battery pack other than those that need to be replenished (e.g., products with poor barcode scanning or batteries 200 with excessive liquid after filling) will be transferred to the feeding buffer pull belt 14. When the number of batteries 200 on the feeding and matching station 15 meets the number of batteries that the robot 8 can pick up in a single operation, the robot 8 will prioritize picking up the batteries 200 on the feeding and matching station 15 and placing them into the feeding pull belt. This helps to free up the feeding and matching station 15 and improves the picking efficiency of the robot 8. Furthermore, when the number of batteries 200 on the replenishment buffer station 5 meets the number that the robot 8 can grab in a single operation, the robot 8 will prioritize grabbing the batteries 200 on the replenishment buffer station 5 and placing them into the liquid injection fixture 2 in the battery placement position 1a.

[0133] Of course, in other embodiments, when there are defective batteries 200 in the battery pack, the robot 8 places the defective batteries 200 in the battery pack onto the unloading buffer conveyor belt 14, and transfers the qualified batteries 200 on the unloading pairing station 15 to the unloading conveyor belt, without waiting for the number of batteries 200 on the unloading pairing station 15 to meet the number that the robot 8 can pick up in a single operation. Similarly, it does not need to wait for the number of batteries 200 on the replenishment buffer station 5 to meet the number that the robot 8 can pick up in a single operation before picking up the batteries 200 on the replenishment buffer station 5 and placing them into the liquid injection fixture 2 in the battery placement position 1a.

[0134] In some embodiments, please continue reading Figure 1 The liquid injection system 100 includes a cleaning device 16 disposed on one side of the feed conveyor belt 11, and the control device is capable of controlling the cleaning device 16 to clean the battery 200 passing through the cleaning area of ​​the cleaning device 16.

[0135] In this embodiment, by providing a cleaning device 16 on one side of the feeding conveyor belt 11, after the electrolyte injection is completed, the control device can control the cleaning device 16 to wipe the electrolyte injection port of the battery 200 passing through the cleaning area of ​​the cleaning device 16, so as to remove electrolyte residues outside the injection port.

[0136] Of course, the cleaning device 16 can also clean other parts of the battery 200 except for the electrolyte filling port.

[0137] In some embodiments, please continue reading Figure 1 The injection system 100 includes at least two rotary devices 1.

[0138] The liquid injection system 100 including at least two rotary devices 1 means that the liquid injection system 100 includes multiple rotary devices 1. In the embodiments of this application, the liquid injection system 100 including two rotary devices 1 (which may include two turrets) is described as an example.

[0139] For example, the fully automated liquid dispensing system 100 of this application embodiment can achieve a maximum single-machine output of 16 PPM (16 products per minute).

[0140] In this embodiment, the liquid injection system 100, by setting two rotary devices 1, helps to improve the liquid injection efficiency of the battery 200. Furthermore, the two rotary devices 1 can share the feeding belt 9, the unloading belt 11, and the robot 8, which improves liquid injection efficiency while reducing the number of parts and lowering costs.

[0141] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a residual liquid receiving mechanism 17 disposed on the outer side of the 1 circumference of the rotary device. The control device is capable of controlling the residual liquid receiving mechanism 17 to clean the residual electrolyte in the liquid injection cup of the liquid injection device.

[0142] For ease of explanation, the position of battery placement 1a where residual electrolyte can be cleaned is referred to as the residual electrolyte receiving position. Each battery placement 1a is rotated and shifted sequentially through the inlet / outlet position 10a, the preparation position 10b, at least one static buffer position 10c, the residual electrolyte receiving position 10d, and then returns to the inlet / outlet position 10a. The control equipment controls the residual electrolyte receiving mechanism 17 to clean the residual electrolyte in the filling cup of the filling device at the battery placement 1a located at the residual electrolyte receiving position 10d.

[0143] Here, by setting up the residual liquid receiving mechanism 17, the control device can control the residual liquid receiving mechanism 17 to clean the residual electrolyte in the liquid filling cup of the liquid filling device. This can improve the problem of inaccurate liquid filling volume of the battery 200 in the next round due to residual electrolyte in the liquid filling cup. In addition, the residual liquid receiving mechanism 17 can also be used to hold residual electrolyte, which can improve the problem of electrolyte dripping onto the outside of the residual liquid receiving mechanism 17 and help maintain cleanliness and hygiene.

[0144] This application provides a liquid injection method applied to a liquid injection system 100 for injecting liquid into a battery 200. For example... Figures 1 to 2 As shown, the liquid injection system 100 includes a control device, a rotary device 1, a liquid injection device, a liquid preparation mechanism 3, a loading and unloading station 4, a liquid replenishment and buffer station 5, a transfer mechanism, a first weighing device 61, and a second weighing device 72.

[0145] Figure 3 This is a schematic diagram illustrating the implementation process of a liquid injection method provided in an embodiment of this application, as shown below. Figure 3 As shown, the injection method includes the following steps S301 to S304:

[0146] Step S301: The control device controls the second weighing device to weigh the battery to be injected with liquid.

[0147] In step S302, the control equipment controls the transfer mechanism to transfer the batteries to be injected or replenished from the loading / unloading station to the battery placement position of the rotary device.

[0148] Here, the control equipment is used to control the operation of the rotary device 1, the liquid injection device, the liquid preparation mechanism 3, the transfer mechanism, and the first weighing device 61 and the second weighing device 72. The control equipment may include, but is not limited to, at least one of an industrial computer, a programmable logic controller (PLC), or a host computer. The host computer may be, for example, a server, a laptop, a tablet, a desktop computer, or a smartphone.

[0149] Please see Figure 1 The loading / unloading station 4 is located on the outer side of the rotary device 1, and is configured to hold batteries 200 to be injected with electrolyte and batteries 200 after being injected with electrolyte. The electrolyte replenishment buffer station 5 is configured to buffer batteries 200 to be replenished with electrolyte. The transfer mechanism is configured to move batteries 200 after being injected with electrolyte from battery placement station 1a to loading / unloading station 4, and move batteries 200 to be injected with electrolyte from loading / unloading station 4 to battery placement station 1a, or move batteries 200 to be replenished with electrolyte from electrolyte replenishment buffer station 5 to battery placement station 1a.

[0150] Please see Figure 1 The rotary device 1 is provided with at least two battery placement positions 1a, each battery placement position 1a being spaced apart circumferentially along the rotary device 1. Each battery placement position 1a is configured to mount a liquid injection clamp 2 for accommodating batteries 200, allowing for vacuuming, settling, and other steps on the batteries 200 in the liquid injection clamp 2. Because the battery placement positions 1a are spaced apart circumferentially along the rotary device 1, the rotary device 1 can rotate to drive the liquid injection clamp 2 within each battery placement position 1a to move circumferentially along the rotary device 1, thereby controlling the battery placement positions 1a to perform different steps and ultimately complete the liquid injection process.

[0151] The rotary device 1 being provided with at least two battery placement positions 1a means that the number of battery placement positions 1a is two or more. For example, the number of battery placement positions 1a can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, etc.

[0152] It should be noted that the "multiple" mentioned in the embodiments of this application refers to two or more.

[0153] In some embodiments, please refer to Figure 1 and Figure 2 The liquid injection system 100 includes a liquid injection clamp 2. The liquid injection clamp 2 is configured to hold a battery 200 to be injected or replenished with liquid, and a transfer mechanism is used to move the liquid injection clamp 2, which holds the battery 200 to be injected or replenished with liquid, to the battery placement position 1a.

[0154] The liquid injection clamp 2 refers to the structure used to accommodate and position the battery 200. During the liquid injection process, the receiving groove 2a of the liquid injection clamp 2 is used to support the battery 200, and different mechanisms of the liquid injection system 100 perform different treatments on the battery 200. Different batteries 200 may require different liquid injection clamps 2, thus, different liquid injection clamps 2 can be used to support different types of batteries 200.

[0155] For example, the slewing device 1 (e.g., a turret) includes a mounting bracket, a turntable rotatably mounted on the mounting bracket, and a drive for driving the turntable to rotate.

[0156] Here, the turntable is driven to rotate horizontally by a drive unit. The direction of rotation of the turntable can be either counterclockwise or clockwise. The drive unit drives the turntable to rotate, thereby rotating the battery placement position 1a.

[0157] For example, the driving element is a motor.

[0158] In step S303, the control device controls the rotating device to rotate the battery placement position. In response to the battery to be injected or replenished moving to the backup liquid position, the control device controls the backup liquid mechanism to prepare liquid for the injection device equipped in the battery placement position located in the backup liquid position, and controls the injection device to evacuate the battery.

[0159] For example, the control device controls the drive of the rotary device to drive the turntable to rotate, and as the turntable rotates, the battery placement position 1a rotates.

[0160] For example, each battery placement position 1a is provided with a corresponding liquid injection device, which is used to inject liquid into the battery 200 on the corresponding battery placement position 1a.

[0161] The liquid preparation mechanism 3 is configured to prepare liquid for the liquid injection device passing through the liquid preparation area of ​​the liquid preparation mechanism 3 (at this time, the battery placement position 1a is located in the liquid preparation position). For example, the control device controls the battery placement position 1a, where the battery 200 to be injected is placed, to rotate to the liquid preparation area, and the control device controls the liquid preparation mechanism 3 to inject a certain amount of electrolyte into the injection cup of the liquid injection device. The injection cup is used to inject liquid into the battery 200.

[0162] Here, while the control equipment controls the liquid preparation mechanism 3 to prepare liquid for the liquid injection device located in the liquid preparation area, it can also control the liquid injection device to evacuate the battery 200.

[0163] In step S304, in response to the completion of liquid preparation, the control device controls the rotary device to rotate the battery placement position 1a, and controls the liquid injection device to inject liquid into the battery before the battery placement position 1a rotates back to the inlet / outlet position 10a.

[0164] In this way, electrolyte injection can be completed while the battery placement position 1a rotates back from the inlet / outlet position 10a. For example, electrolyte injection can be completed at the preparation position, or during the rotation through the settling buffer position after preparation. By setting at least two battery placement positions 1a, while the loading / unloading, preparation, vacuuming, and settling of batteries 200 are being performed at the loading / unloading station 4, the electrolyte injection devices located at the other battery placement positions 1a can inject electrolyte into the batteries 200, for example, by performing positive and negative pressure circulating electrolyte injection, which is beneficial for the full absorption of electrolyte, saves time, and improves production efficiency.

[0165] In step S305, in response to the completion of liquid injection, the control device controls the first weighing device 61 to weigh the liquid-injected battery that has been moved out of the battery placement position 1a, and transfers the weighed battery to be replenished to the replenishment buffer position.

[0166] Optionally, the discharge detection device 6 is used to detect the battery 200 after it has been filled with liquid, in order to detect whether the battery 200 is qualified.

[0167] Please see Figure 1 The unloading detection device 6 may include a first weighing device 61, which is configured to weigh the battery 200 after liquid injection to confirm whether the liquid injection amount of the battery 200 meets the standard. If the liquid is insufficient, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5. If the liquid is excessive, the unqualified battery 200 is transferred to the unloading buffer conveyor belt 14. If the liquid injection amount meets the standard, the qualified battery 200 is conveyed to the next process, thereby realizing automatic liquid replenishment of the battery 200.

[0168] It should be noted that the specific structure of the first weighing device 61 is not limited here, as long as it can automatically weigh the battery 200.

[0169] In some embodiments, step S305 may include: in response to the completion of liquid injection, the control device controls the first weighing device 61 to weigh the injected battery that has been removed from the battery placement position 1a; based on the difference between the weight of the battery weighed by the first weighing device 61 and the weight of the battery weighed by the second weighing device, confirming whether the liquid injection amount of the battery 200 meets the standard; if there is insufficient liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5; if there is excessive liquid, the unqualified battery 200 is transferred to the unloading buffer conveyor belt 14; if the liquid injection amount meets the standard, the qualified battery 200 is conveyed to the next process for subsequent processing.

[0170] The liquid injection method of this application embodiment, on the one hand, controls the transfer mechanism to move the battery 200 to be injected from the loading / unloading station 4 to the battery placement station 1a, or moves the battery 200 to be replenished from the replenishment buffer station 5 to the battery placement station 1a. Then, the rotary device 1 is controlled to rotate, and the liquid preparation mechanism 3 is controlled to prepare liquid for the liquid injection device to achieve automatic liquid preparation. After the automatic liquid preparation is completed, the liquid injection device is controlled to inject liquid into the battery 200 on the battery placement station 1a before the battery placement station 1a returns to the loading / unloading station 10a, thereby realizing fully automatic liquid injection of the battery 200, improving the automation level of liquid injection of the battery 200, improving production efficiency, and reducing labor costs. On the other hand, by setting up a first weighing device 61 to weigh the battery 200 after liquid injection and transfer the weighed battery 200 to be replenished to the liquid replenishment buffer station 5, the yield rate can be improved while the automatic liquid replenishment of the battery 200 can be realized, further improving the automation level of liquid injection of the battery 200.

[0171] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding belt 9, a feeding buffer belt 12, and a feeding detection device 7 disposed on one side of the feeding belt 9.

[0172] The injection method may include the following steps S321 to S322:

[0173] Step S321: The control equipment controls the feeding belt to transport the battery to be injected with liquid.

[0174] In step S322, the control equipment controls the feeding detection device to detect the batteries passing through the detection area of ​​the feeding detection device, and transfers the qualified batteries to the loading and unloading station, and transfers the unqualified batteries to the feeding buffer conveyor belt.

[0175] After steps S321 and S322, step S302 is performed, in which the control device controls the transfer mechanism to transfer the batteries to be injected or replenished at the loading / unloading station to the battery placement position of the rotary device.

[0176] Here, the feeding belt 9 is used to feed the battery 200. For example, the feeding belt 9 includes a first end and a second end along the conveying direction. The first end of the feeding belt 9 is the feeding end, and the second end of the feeding belt 9 is the picking position 9a. The battery 200 to be injected with liquid enters from the feeding end, and the feeding belt 9 conveys the battery 200 to be injected with liquid to the picking position 9a.

[0177] Robot 8 transfers qualified batteries 200 from picking position 9a to loading / unloading position 4, for example, transferring qualified batteries 200 from picking position 9a to liquid injection fixture 2 on loading / unloading position 4. It then transfers the liquid-injected batteries 200 from loading / unloading position 4 to unloading position 11a, for example, transferring the liquid-injected batteries 200 from loading / unloading position 4 to liquid injection fixture 2 on unloading position 11a.

[0178] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding detection device 7 disposed on one side of the feeding conveyor belt 9. The control equipment can control the feeding detection device 7 to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7.

[0179] In this embodiment, by setting up a feeding detection device 7 to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7, it is beneficial to promptly detect whether the batteries 200 to be injected with liquid are qualified, thereby improving the production efficiency of the batteries 200.

[0180] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding buffer belt 12, and the control equipment can control the robot 8 to transfer the unqualified batteries 200 after being detected by the feeding detection device 7 to the feeding buffer belt 12.

[0181] For example, a battery 200 that fails the test is a product with a faulty barcode or a battery 200 that has an internal short circuit problem.

[0182] In this embodiment, by setting up a feeding buffer belt 12 to buffer unqualified batteries 200, there is no need to stop the line for processing, and the problem of defective products flowing to the end is avoided, which is conducive to improving the degree of automation and production efficiency.

[0183] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes a feeding and matching station 13.

[0184] Transferring qualified batteries 200 to loading / unloading station 4 (step S3221) and transferring unqualified batteries 200 to loading buffer conveyor belt 12 (step S3222) may include the following steps:

[0185] The control equipment transfers the battery packs that have passed the inspection to the loading and unloading station 4 (step S3221), and transfers the battery packs that have failed the inspection to the loading and matching station 13 (step S3222a). The unqualified battery packs contain at least one unqualified battery 200.

[0186] The control equipment transfers the unqualified batteries 200 on the feeding and pairing station 13 to the feeding buffer pull belt 12 (step S3222b). If the qualified batteries 200 on the feeding and pairing station 13 reach a preset number, the control equipment transfers the preset number of batteries 200 to the loading and unloading station 4 (step S3222c).

[0187] Understandably, since robot 8 can transfer multiple batteries at a time (e.g., 4, 5, 6, 7, 8, 9, 10, etc.), multiple batteries can be grouped together, which facilitates robot 8's grasping and transfer.

[0188] In this embodiment, by setting up a feeding and matching station 13, when the robot 8 picks up the battery 200, if there are unqualified batteries 200 in the battery pack, the robot 8 transfers the unqualified battery pack to the feeding and matching station 13, and then puts the unqualified batteries 200 in the battery pack into the feeding buffer pull belt 12. When all the battery packs are qualified, the entire battery pack is put into the liquid injection fixture 2. When the number of batteries 200 on the feeding and matching station 13 meets the number of batteries that the robot 8 can pick up in a single operation, the robot 8 prioritizes picking up the batteries 200 on the matching mechanism and putting them into the liquid injection fixture 2. This helps to free up the feeding and matching station 13 and improves the efficiency of the robot 8 in filling the liquid injection fixture 2.

[0189] Of course, in other embodiments, when there are defective products, the robot 8 puts the defective battery 200 in the battery pack onto the loading buffer conveyor belt 12, and transfers the qualified battery 200 on the loading and matching station 13 to the loading and unloading station 4, without waiting for the number of batteries 200 on the loading and matching station 13 to meet the number of batteries that the robot 8 can grab in a single operation before grabbing them.

[0190] In some embodiments, please refer to Figure 1 The control equipment controls the feeding and detection device 7 to detect the batteries 200 passing through the detection area of ​​the feeding and detection device 7, including:

[0191] The feeding and detection device 7 includes a first barcode scanning device 71. The control equipment can control the first barcode scanning device 71 to scan the batteries 200 passing through the scanning area of ​​the first barcode scanning device 71.

[0192] It should be noted that the specific type of the first scanning device 71 is not limited here. For example, it can be a barcode scanner, a camera, etc.

[0193] The first scanning device 71 is located on one side of the feeding conveyor belt 9, which facilitates scanning of the battery 200 passing through the scanning area of ​​the first scanning device 71.

[0194] In this embodiment, by setting a first scanning device 71 for automatically scanning the battery 200, it is beneficial to identify and bind the information of the battery 200, so as to realize the tracking and recording of the battery 200 throughout the liquid injection process and improve the reliability of liquid injection.

[0195] In some embodiments, please refer to Figure 1 The feeding and detection device 7 includes a second weighing device 72. The control equipment can control the second weighing device 72 to weigh the batteries 200 passing through the weighing area of ​​the second weighing device 72.

[0196] It should be noted that the specific structure of the second weighing device 72 is not limited here, as long as it can automatically weigh the battery 200.

[0197] The second weighing device 72 is located on one side of the feeding conveyor belt 9, which facilitates the weighing of the battery 200 passing through the weighing area of ​​the second weighing device 72 and obtains the weight of the battery 200 before liquid injection.

[0198] In this embodiment, by setting a second weighing device 72 to automatically weigh the battery 200, the weight of the battery 200 before liquid injection can be obtained. Then, the first weighing device 61 weighs the battery 200 after liquid injection. The first weighing device 61 and the second weighing device 72 weigh the same battery 200, and the weight of the battery 200 before liquid injection obtained by the second weighing device 72 is subtracted from the weight of the battery 200 after liquid injection obtained by the first weighing device 61 to obtain the amount of liquid injected into the battery 200. This confirms whether the amount of liquid injected into the battery 200 meets the standard. If there is too little liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5. If there is too much liquid, the unqualified battery 200 is transferred to the unloading buffer conveyor belt 14. If the amount of liquid injected meets the standard, the qualified battery 200 is conveyed to the next process, thereby realizing automatic liquid replenishment of the battery 200, improving the reliability of liquid injection into the battery 200 and the yield rate of the battery 200. In addition, it can also realize automatic electrolyte replenishment of battery 200, further improving the automation level of electrolyte filling of battery 200.

[0199] In related technologies, batteries require a baking process before electrolyte injection. However, after baking, the electrode sheets become loose, and some batteries have internal short circuits. Since short-circuit tests are not performed before electrolyte injection, defective products may reach end-users. Batteries with internal short circuits cannot be identified after electrolyte injection; therefore, batteries with internal short circuits need to be identified before electrolyte injection.

[0200] In some embodiments, please refer toFigure 1 The feeding and testing device 7 includes a short-circuit testing device 73. The control equipment can control the short-circuit testing device 73 to perform short-circuit testing (high-pot, high-potential) on the batteries 200 passing through the test area of ​​the short-circuit testing device 73.

[0201] It should be noted that the specific structure of the short-circuit test device 73 is not limited here, as long as it can perform automatic short-circuit testing on the battery 200.

[0202] The short-circuit test device 73 is located on one side of the feeding conveyor belt 9, which facilitates short-circuit testing of the battery 200 passing through the test area of ​​the short-circuit test device 73.

[0203] In this embodiment, by setting up a short-circuit testing device 73 to automatically short-circuit test the battery 200, it is beneficial to promptly identify batteries 200 with internal short circuit problems before liquid injection, improve the problem of defective products flowing to the end, and increase the yield of battery 200.

[0204] For example, the first barcode scanning device 71, the second weighing device 72, and the short-circuit testing device 73 are arranged sequentially along the conveying direction of the feeding belt 9.

[0205] Of course, the first scanning device 71 and the second weighing device 72 can also be set at the same workstation. That is to say, the battery 200 can be scanned by the first scanning device 71 and weighed by the second weighing device 72 at the same workstation.

[0206] The following embodiment of this application provides an implementation flow of a liquid injection method, which includes the following steps S801 to S816:

[0207] Step S801: The battery to be injected with liquid is conveyed by a feeding belt.

[0208] Step S802: Scan the code and weigh the battery to be injected, and determine whether the battery to be injected is qualified.

[0209] If not, proceed to step S803; if yes, proceed to step S804.

[0210] In step S803, the defective batteries are transferred to the feeding buffer conveyor belt for manual processing.

[0211] Step S804: Perform a Hi-pot test on the battery to be injected and determine whether the battery to be injected is qualified.

[0212] If not, proceed to step S803; if yes, proceed to step S805.

[0213] Step S805: Transfer the battery to the liquid injection fixture at the loading and unloading station.

[0214] In step S806, the control equipment controls the transfer mechanism to transfer the liquid injection fixture from the loading and unloading station to the rotary device.

[0215] Step S807: The control equipment controls the liquid preparation mechanism to prepare liquid for the injection device located in the liquid preparation area.

[0216] Step S808: The control device controls the liquid injection device to evacuate the battery.

[0217] Steps S807 and S808 can be performed simultaneously.

[0218] Step S809: The control device controls the electrolyte injection device to inject electrolyte into the battery.

[0219] The battery is injected with electrolyte through positive and negative pressure cycles.

[0220] In step S810, the control device controls the residual liquid receiving mechanism to inject liquid into the battery.

[0221] Step S811: The control equipment controls the transfer mechanism to transfer the liquid injection clamp on the rotary device to the loading and unloading station.

[0222] Step S812: Transfer the battery that has been filled with liquid in the liquid injection fixture to the unloading conveyor belt.

[0223] Step S813: Scan the code and weigh the battery after it has been filled with electrolyte, and determine whether the battery to be filled with electrolyte is qualified.

[0224] If not, proceed to step S814; if yes, proceed to step S815.

[0225] Step S814: Transfer the defective batteries to the electrolyte replenishment buffer station for automatic electrolyte replenishment.

[0226] If multiple attempts to replenish the electrolyte fail, the defective batteries will be moved to the unloading buffer conveyor belt for manual processing.

[0227] Step S815: The control device controls the cleaning device to clean the battery.

[0228] Step S816: The battery that has been filled with liquid is conveyed by a feeding belt.

[0229] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0230] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A liquid injection system for injecting liquid into a battery, characterized in that, include: At least two rotating devices are provided with multiple battery placement positions arranged circumferentially and capable of rotational displacement. The battery placement positions are used to place batteries. Each battery placement position passes sequentially through an inlet / outlet position, a liquid preparation position, and at least one static buffer position by rotational displacement and returns to the inlet / outlet position. Each of the battery placement positions is equipped with a liquid injection device, and the liquid injection device is configured to inject liquid into the battery placed in the battery placement position. A liquid preparation mechanism is provided on the circumferential outer side of the rotary device. The liquid preparation mechanism is configured to prepare liquid for the liquid injection device equipped at the battery placement position located at the liquid preparation position. The loading and unloading station is located on the outer circumference of the rotary device, and the loading and unloading station is configured to place the battery to be injected with liquid and the battery after being injected with liquid. A liquid replenishment and buffer station is configured to buffer batteries to be replenished, and the liquid replenishment and buffer station is located between at least two of the rotary devices; The transfer mechanism is configured to move the battery after liquid injection from the battery placement position located at the inlet / outlet position to the loading / unloading position, and move the battery to be injected with liquid from the loading / unloading position to the battery placement position located at the inlet / outlet position, or move the battery to be replenished with liquid from the replenishment buffer position to the battery placement position located at the inlet / outlet position. A first weighing device is configured to weigh the battery after it has been injected with electrolyte; A second weighing device is configured to weigh the battery to be injected with liquid; The system includes a robot, a feeding conveyor belt with a material picking position, and a discharging conveyor belt with a material unloading position. The feeding conveyor belt and the discharging conveyor belt are arranged in the same direction as the at least two rotary devices, and the feeding conveyor belt and the discharging conveyor belt are located on the same side of the at least two rotary devices. The robot is located between the at least two rotary devices and between the liquid replenishment buffer station and the discharging conveyor belt. The at least two rotary devices share the feeding conveyor belt, the discharging conveyor belt, the robot, and the liquid replenishment buffer station. The control device is configured to control the second weighing device to weigh the battery to be injected with electrolyte, then control the transfer mechanism to move the battery to be injected with electrolyte from the loading / unloading station to the battery placement position at the inlet / outlet station, control the rotating device to rotate and shift the battery placement position, control the electrolyte preparation mechanism to prepare electrolyte for the injection device equipped at the battery placement position that has been moved to the electrolyte preparation position, control the injection device to inject electrolyte into the battery at the battery placement position before the battery placement position rotates back to the inlet / outlet station, and control the transfer mechanism to rotate back to the inlet / outlet station. After being injected with electrolyte at the inlet / outlet stations, the batteries are moved from the battery placement station to the loading / unloading station. Then, the first weighing device is controlled to weigh the injected batteries, and the robot is controlled to transfer the weighed batteries awaiting electrolyte replenishment to the electrolyte replenishment buffer station. Subsequently, the transfer mechanism is further controlled to move the batteries awaiting electrolyte replenishment from the electrolyte replenishment buffer station to the battery placement station located at the inlet / outlet stations where no batteries are placed. The control device also controls the robot to transfer qualified batteries from the picking station to the loading / unloading station, and transfer qualified batteries after being injected with electrolyte from the loading / unloading station to the unloading station.

2. The injection system according to claim 1, characterized in that, The electrolyte injection system includes a feeding detection device, and the control device controls the feeding detection device to detect batteries passing through the detection area of ​​the feeding detection device. The feeding detection device includes a second weighing device, which is configured to weigh the batteries to be injected passing through the weighing area of ​​the second weighing device. If the difference between the weight of the battery after liquid injection (measured by the first weighing device) and the weight of the battery to be injected (measured by the second weighing device) does not reach a specified amount, the control device controls the robot to transfer the battery to the liquid replenishment buffer station.

3. The injection system according to claim 2, characterized in that, The feeding detection device is located on one side of the feeding conveyor belt.

4. The injection system according to claim 3, characterized in that, The feeding and detection device also includes a first barcode scanning device, and the control device controls the first barcode scanning device to scan the batteries passing through the barcode scanning area of ​​the first barcode scanning device.

5. The injection system according to claim 3 or 4, characterized in that, The feeding detection device also includes a short-circuit testing device, and the control device controls the short-circuit testing device to perform short-circuit testing on batteries passing through the test area of ​​the short-circuit testing device.

6. The injection system according to claim 3 or 4, characterized in that, The liquid injection system includes a feeding buffer belt, and the control device controls the robot to transfer batteries that fail the inspection by the feeding detection device to the feeding buffer belt.

7. The injection system according to claim 6, characterized in that, The liquid injection system includes a feeding and pairing station. The control device controls the robot to transfer unqualified battery packs detected by the feeding detection device to the feeding and pairing station. The unqualified battery packs contain at least one unqualified battery. The control device controls the robot to transfer the unqualified batteries from the feeding and pairing station to the feeding buffer conveyor belt, and to transfer qualified batteries from the feeding and pairing station to the unloading and loading station.

8. The injection system according to claim 3 or 4, characterized in that, The liquid injection system includes a discharge detection device, which includes a first weighing device and a second barcode scanning device disposed on one side of the discharge conveyor belt. The control device controls the second barcode scanning device to scan the batteries passing through the barcode scanning area of ​​the second barcode scanning device.

9. The injection system according to claim 8, characterized in that, The liquid injection system includes a feeding buffer conveyor belt, and the control device controls the robot to transfer batteries that fail the inspection by the feeding detection device to the feeding buffer conveyor belt.

10. The injection system according to claim 9, characterized in that, The liquid injection system includes a feeding and matching station. The control device controls the robot to transfer unqualified battery packs, which are detected by the feeding detection device, to the feeding and matching station. The unqualified battery packs contain at least one unqualified battery. The control device controls the robot to transfer batteries that need to be replenished at the feeding and matching station to the liquid replenishment buffer station, transfer unqualified batteries other than those needing liquid replenishment to the feeding buffer conveyor belt, and transfer qualified batteries from the feeding and matching station to the feeding conveyor belt.

11. The injection system according to claim 3 or 4, characterized in that, The liquid injection system includes a cleaning device located on one side of the feed conveyor belt, and the control device is capable of controlling the cleaning device to clean the batteries passing through the cleaning area of ​​the cleaning device.

12. The injection system according to claim 1, characterized in that, The liquid injection system includes a liquid injection clamp configured to accommodate the battery to be injected, the battery to be replenished, or the battery after liquid injection. The transfer mechanism is used to move the liquid injection clamp containing the battery to be injected or replenished from the loading / unloading station to the battery placement station, or to move the liquid injection clamp containing the battery after liquid injection from the battery placement station to the loading / unloading station.

13. The injection system according to claim 1, characterized in that, The rotary device includes at least two stationary buffer positions, and each stationary buffer position is arranged at intervals along the circumference of the rotary device.

14. The injection system according to claim 1, characterized in that, The liquid injection system includes a residual liquid receiving mechanism located on the circumferential outer side of the rotary device. Each of the battery placement positions is rotated and shifted sequentially through the inlet / outlet position, the prepared liquid position, at least one of the static buffer positions, the residual liquid receiving position, and then returns to the inlet / outlet position. The control device controls the residual liquid receiving mechanism to clean the residual electrolyte in the injection cup of the injection device for the battery placement position located at the residual liquid receiving position.

15. A liquid injection method, applied to a liquid injection system for injecting liquid into a battery, the liquid injection system comprising a control device, at least two rotary devices, a liquid injection device, a liquid preparation mechanism, a loading and unloading station, a loading conveyor belt with a material picking position, a unloading conveyor belt with a material unloading position, a liquid replenishment buffer station, a transfer mechanism, a robot, a first weighing device, and a second weighing device, wherein, The rotary device is provided with multiple stationary battery placement positions arranged circumferentially and capable of rotational displacement. Each battery placement position is used to place batteries. Each battery placement position rotates and shifts sequentially through an inlet / outlet position, a liquid preparation position, at least one stationary buffer position, and returns to the inlet / outlet position. The liquid replenishment buffer position is located between at least two rotary devices. The arrangement direction of the feeding and unloading conveyor belts is the same as the arrangement direction of the at least two rotary devices, and the feeding and unloading conveyor belts are located on the same side of the at least two rotary devices. The robot is located between the at least two rotary devices and between the liquid replenishment buffer position and the unloading conveyor belt. The at least two rotary devices share the feeding conveyor belt, the unloading conveyor belt, the robot, and the liquid replenishment buffer position. The liquid injection method includes: The control device controls the second weighing device to weigh the battery to be injected with liquid; The control device controls the robot to transfer the battery to be injected with electrolyte from the material picking position to the loading and unloading position; The control device controls the transfer mechanism to transfer the batteries to be injected with liquid at the loading and unloading station or the batteries to be replenished with liquid at the replenishment and buffer station to the battery placement position of the rotary device; The control device controls the rotary device to rotate the battery placement position. In response to the battery to be injected or the battery to be replenished moving to the backup liquid position, the control device controls the backup liquid mechanism to prepare liquid for the injection device equipped at the battery placement position located at the backup liquid position, and controls the injection device to evacuate the battery. In response to the completion of liquid preparation, the control device controls the rotary device to rotate the battery placement position, and controls the liquid injection device to inject liquid into the battery before the battery placement position rotates back to the inlet / outlet position; In response to the completion of liquid injection, the control device controls the first weighing device to weigh the liquid-injected battery that has been moved out of the battery placement position, and controls the robot to transfer the weighed battery to the liquid replenishment buffer station. The control device controls the robot to transfer the qualified batteries after liquid injection from the loading / unloading station to the unloading station.

16. The injection method according to claim 15, characterized in that, The liquid injection system includes a feeding buffer belt and a feeding detection device disposed on one side of the feeding buffer belt. Before the control device controls the transfer mechanism to transfer the battery to be injected at the loading / unloading station or to be replenished at the replenishment buffer station to the battery placement position of the rotary device, the system includes: The control device controls the feeding conveyor belt to transport the battery to be injected with liquid; The control device controls the loading and inspection device to inspect the batteries passing through the inspection area of ​​the loading and inspection device, and controls the robot to transfer the qualified batteries to the loading and unloading station, and transfer the unqualified batteries to the loading buffer conveyor.

17. The injection method according to claim 16, characterized in that, The liquid injection system includes a feeding and pairing station. The process of transferring qualified batteries to the loading and unloading station and transferring unqualified batteries to the feeding buffer conveyor belt includes: The control equipment transfers battery packs that pass the inspection to the loading and unloading station, and transfers battery packs that fail the inspection to the loading and pairing station. The unqualified battery packs contain at least one unqualified battery. The control device transfers the batteries that fail the inspection at the feeding and pairing station to the feeding buffer conveyor belt. If the number of batteries that pass the inspection at the feeding and pairing station reaches a preset number, the control device transfers the preset number of batteries to the loading and unloading station.

18. The injection method according to claim 16 or 17, characterized in that, The control device controls the feeding and detection device to detect batteries passing through the detection area of ​​the feeding and detection device, including: The feeding and detection device includes a second weighing device, and the control device controls the second weighing device to weigh the batteries passing through the weighing area of ​​the second weighing device; The feeding detection device includes a short-circuit testing device, and the control device controls the short-circuit testing device to perform short-circuit testing on batteries passing through the test area of ​​the short-circuit testing device. The feeding and detection device includes a first barcode scanning device, and the control device controls the first barcode scanning device to scan the batteries passing through the barcode scanning area of ​​the first barcode scanning device.

Images