Liquid injection system and liquid injection method

Abstract

The embodiment of the invention provides a liquid injection system and a liquid injection method. The liquid injection system comprises a rotating device, a liquid injection device, a liquid preparation mechanism, a feeding and discharging station, a liquid supplementing buffering station, a transferring mechanism, a first weighing device, a second weighing device and control equipment. The rotating device is provided with a battery placing position. And the liquid injection device is arranged on the battery placement position and is configured to inject liquid into the battery on the battery placement position. And the liquid preparation mechanism is configured to prepare liquid for the liquid injection device passing through the liquid preparation area of the liquid preparation mechanism. And the loading and unloading station is configured to place a battery to be injected and a battery after injection. And the liquid supplementing cache station is configured to cache the battery to be supplemented with liquid. The transfer mechanism is configured to move the battery. And the first weighing device is configured to weigh the battery after liquid injection. And the second weighing device is configured to weigh the battery to be filled with liquid. According to the liquid injection system provided by the embodiment of the invention, automatic liquid supplementing of the battery can be realized, and the automation degree of liquid injection of the battery is improved.

Description

[0001] This application is a divisional application of the invention patent application with the application date of April 16, 2024, application number 202410452923.4, and invention name “Injection system and injection method”. Technical Field

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

[0003] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0004] During the production process of batteries, it is usually necessary to perform processes such as injection and sealing. The injection process refers to injecting electrolyte into the battery through the injection hole set on the battery. In the related art, the injection equipment has low automation, low production efficiency and high labor cost. Summary of the invention

[0005] In view of this, the embodiments of the present application hope to provide a liquid injection system and a liquid injection method, which can improve the degree of automation and production efficiency and reduce labor costs.

[0006] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a liquid injection system for injecting liquid into a battery, which comprises: a rotating device, provided with a plurality of battery placement positions arranged along the circumferential direction and capable of rotational displacement, the battery placement positions being used to place batteries, each of the battery placement positions passing through an inlet and outlet position, a liquid reserve position, at least one static buffer position in sequence through rotational displacement and returning to the inlet and outlet position; a liquid injection device, each of the battery placement positions is respectively equipped with the liquid injection device, the liquid injection device is configured to inject liquid into the battery placed at the battery placement position; a liquid reserve mechanism arranged on the circumferential outer side of the rotating device, the liquid reserve mechanism The invention relates to a liquid filling device for preparing liquid for the battery placement position located at the liquid preparation position; a loading and unloading station arranged on the circumferential outer side of the rotary device, the loading and unloading station being configured to place batteries to be filled with liquid and batteries after liquid filling; a liquid replenishment buffer station being configured to buffer batteries to be filled with liquid; a transfer mechanism being configured to move the batteries after liquid filling from the battery placement position located at the inlet and outlet positions to the loading and unloading station, and to move the batteries to be filled with liquid from the loading and unloading station to the battery placement position located at the outlet position, or to move the batteries to be filled with liquid from the liquid replenishment buffer station to the battery placement position located at the inlet and outlet positions. the battery placement position; a first weighing device, the first weighing device is configured to weigh the battery after liquid injection; a second weighing device, the second weighing device is configured to weigh the battery to be injected with liquid; a control device, the control device is configured to control the second weighing device to weigh the battery to be injected with liquid, and then control the transfer mechanism to move the battery to be injected with liquid located at the loading and unloading station to the battery placement position located at the inlet and outlet position, control the rotary device to rotate and shift the battery placement position, and control the liquid preparation mechanism to rotate the liquid injection device equipped at the battery placement position shifted to the liquid preparation position. The battery placement position is provided with a reserve liquid, and the liquid injection device after the liquid preparation is controlled to inject liquid into the battery at the battery placement position before the battery placement position rotates back to the inlet and outlet position, and the transfer mechanism is controlled to move the battery after the liquid injection that rotates back to the inlet and outlet position from the battery placement position to the loading and unloading station, and then the first weighing device is controlled to weigh the battery after the liquid injection, and after the battery to be replenished is transferred to the replenishment buffer station after weighing, the transfer mechanism is further controlled to move the battery to be replenished at the replenishment buffer station to the battery placement position located at the inlet and outlet position and where no battery is placed.

[0007] Thus, the transfer mechanism is controlled by the control device to move the battery to be filled at the loading and unloading station to the battery placement position, or the battery to be filled at the filling buffer station is moved to the battery placement position, and then the rotary device is controlled to rotate the battery placement position carrying the battery, and the liquid preparation mechanism is controlled to prepare the liquid for the liquid injection device to realize automatic liquid preparation. After the automatic liquid preparation is completed, the liquid injection device is controlled to complete the liquid injection of the battery at the battery placement position before rotating back to the loading and unloading station, thereby realizing full-automatic liquid injection of the battery, improving the automation of battery liquid injection, improving production efficiency, and reducing labor costs. In addition, by setting a first weighing device for weighing the battery after liquid injection, and transferring the weighed battery to be filled to the filling buffer station, thereby, while improving the yield rate, the automatic liquid filling of the battery can also be realized, further improving the automation of battery liquid injection.

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

[0009] In this embodiment, by setting a feeding detection device to detect the batteries passing through the detection area of ​​the feeding detection device, it is helpful to timely find out whether the battery to be injected is qualified, thereby improving the production efficiency of the battery. The second weighing device is used to automatically weigh the battery, that is, to obtain the weight of the battery before injection, and then weigh the battery after injection through the first weighing device, and weigh the same battery through the first weighing device and the second weighing device, and subtract the weight of the battery before injection measured by the second weighing device from the weight of the battery after injection measured by the first weighing device to obtain the injection amount of the battery, so as to confirm whether the injection amount of the battery meets the standard.

[0010] In some embodiments, the injection system includes a robot, a loading pull belt with a material picking position, and a unloading pull belt with a material unloading position. The loading detection device is arranged on one side of the loading pull belt. The control device can control the robot to transfer the qualified batteries at the material picking position to the loading and unloading station, and transfer the batteries after injection at the loading and unloading station to the unloading position.

[0011] Exemplarily, the robot is a six-axis robot. Compared with coordinate axis loading and unloading, the six-axis robot has high flexibility and is more stable and reliable during the transfer process. By setting up a robot to transfer qualified batteries from the material picking position to the loading and unloading station, and to transfer the batteries after injection from the loading and unloading station to the unloading position, it is conducive to realizing the automatic operation of the machine and reducing labor costs.

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

[0013] It is used to automatically scan the battery, which is helpful to identify and bind the battery information, so as to realize the tracking record of the battery in the whole filling process and improve the reliability of the filling.

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

[0015] The short-circuit test device is used to perform automatic short-circuit test on the battery, which is helpful to timely pick out the battery with internal short circuit problem before liquid injection, improve the problem of defective products flowing to the terminal, and improve the yield rate of the battery.

[0016] In some embodiments, the injection system includes a loading buffer pull belt, and the control device can control the robot to transfer unqualified batteries detected by the loading detection device to the loading buffer pull belt.

[0017] The loading buffer pull belt is used to buffer unqualified batteries. There is no need to stop the line for processing, nor will it cause the problem of defective products flowing to the terminal, which is conducive to improving the degree of automation and production efficiency.

[0018] In some embodiments, the injection system includes a loading and pairing station, and the control device can control the robot to transfer unqualified battery packs detected by the loading detection device to the loading and pairing station, and the unqualified battery packs contain at least one unqualified battery. The control device can control the robot to transfer the unqualified batteries at the loading and pairing station to the loading and unloading station.

[0019] In this embodiment, by setting up a loading and pairing station, when the robot grabs batteries, when there are defective products, the robot will transfer the battery pack containing the unqualified batteries to the loading and pairing station, and then put the defective products in the battery pack into the loading buffer pull belt. When the entire battery pack is qualified, the entire battery pack is placed in the liquid filling fixture. When the number of batteries in the loading and pairing station meets the number of batteries that the robot can grab at a single time, the robot will give priority to grabbing the batteries of the pairing mechanism and placing them in the liquid filling fixture, which is beneficial to vacating the loading and pairing station and is beneficial to improving the efficiency of the robot in filling the liquid filling fixture.

[0020] In some embodiments, the injection system includes a material unloading detection device, which includes a first weighing device and a second scanning device arranged on one side of the material unloading pull belt, and the control device can control the second scanning device to scan the batteries passing through the scanning area of ​​the second scanning device.

[0021] The second barcode scanning device is used to automatically scan the battery after liquid injection, which is conducive to identifying and binding the information of the battery after liquid injection, so as to realize the tracking record of the battery in the whole liquid injection process and improve the reliability of liquid injection.

[0022] In some embodiments, the injection system includes a material unloading buffer pull belt, and the control device can control the robot to transfer unqualified batteries detected by the unloading detection device to the material unloading buffer pull belt.

[0023] The unloading buffer pull belt is used to buffer unqualified batteries after liquid filling. There is no need to stop the line for processing, nor will it cause the problem of defective products flowing to the terminal, which is conducive to improving the degree of automation and production efficiency.

[0024] In some embodiments, the injection system includes a material unloading pairing station, and the control device can control the robot to transfer unqualified battery packs detected by the material unloading detection device to the material unloading pairing station, and the unqualified battery packs contain at least one unqualified battery. The control device can control the robot to transfer the batteries to be replenished at the material unloading pairing station to the replenishment buffer station, transfer the unqualified batteries other than those to be replenished to the material unloading buffer pull belt, and transfer the qualified batteries at the material unloading pairing station to the material unloading pull belt.

[0025] In this embodiment, by setting up a material unloading and pairing station, when the robot grabs batteries, if there are defective products, the robot will transfer the battery pack containing unqualified batteries to the material unloading and pairing station, and transfer the batteries to be refilled in the battery pack to the refilling buffer station, and then transfer the unqualified batteries in the battery pack other than those to be refilled (for example, products with poor code scanning or batteries with excess liquid after injection) to the material unloading buffer drawstring. When the number of batteries in the material unloading and pairing station meets the number of batteries that the robot can grab at a single time, the robot will give priority to grabbing the batteries in the material unloading and pairing station and putting them into the material unloading drawstring, which is conducive to freeing up the material unloading and pairing station and improving the robot's grabbing efficiency. And when the number of batteries in the refilling buffer station meets the number of batteries that the robot can grab at a single time, the robot will give priority to grabbing the batteries in the refilling buffer station and putting them into the injection fixture of the battery placement position.

[0026] In some embodiments, the injection system includes a cleaning device disposed on one side of the unloading belt, and the control device can control the cleaning device to clean the batteries passing through a cleaning area of ​​the cleaning device.

[0027] The control device can control the cleaning device to wipe the liquid injection port of the battery passing through the cleaning area of ​​the cleaning device to wipe off the electrolyte residue outside the liquid injection port.

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

[0029] The injection fixture refers to a structure used to hold the battery and can position the battery. During the injection process, the battery is supported by the receiving slot of the injection fixture, and different mechanisms of the injection system process the battery differently. Different batteries may require different injection fixtures. Therefore, different types of batteries can be replaced with different injection fixtures to support the battery.

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

[0031] It is beneficial to improve the battery filling efficiency, and the two rotating devices can share the loading and unloading pull belts and robots, which not only improves the filling efficiency but also reduces the number of parts and reduces costs.

[0032] In some embodiments, the rotary device includes at least two static buffer positions, each of which is arranged at intervals along the circumference of the rotary device.

[0033] This will help improve the battery filling efficiency and increase production cycle time.

[0034] In some embodiments, the liquid injection system includes a residual liquid receiving mechanism arranged on the circumferential outer side of the rotating device. Each battery placement position passes through the input and output position, the reserve liquid position, at least one static buffer position, the residual liquid receiving position and returns to the input and output position in sequence through rotation and displacement. 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] In this way, the problem of inaccurate filling amount of the next round of batteries caused by residual electrolyte in the filling cup can be improved. In addition, the residual liquid receiving mechanism can also be used to hold residual electrolyte, which can improve the problem of electrolyte dripping on the outside of the residual liquid receiving mechanism, which is conducive to maintaining cleanliness and hygiene.

[0036] In some embodiments, the injection system includes at least two rotating devices, and the liquid replenishment buffer station is arranged between the at least two rotating devices.

[0037] This facilitates the two rotary devices to share the liquid replenishment buffer station.

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

[0039] This makes it easier for the robot to carry out transportation using a shorter moving path and also facilitates sharing of the robot.

[0040] The second aspect of the embodiment of the present application provides a liquid injection method, which is applied to a liquid injection system for injecting liquid into a battery, wherein the liquid injection system comprises a control device, a rotary device, a liquid injection device, a liquid preparation mechanism, a loading and unloading station, a liquid replenishment buffer station, a transfer mechanism, a first weighing device and a second weighing device, wherein the rotary device is provided with a plurality of static station battery placement positions arranged along the circumferential direction and capable of rotation and displacement, the battery placement positions being used to place batteries, and each battery placement position passes through the material inlet and outlet position, the liquid preparation position, at least one static buffer position in sequence through rotation and displacement and returns to the material inlet and outlet position, and the liquid injection method comprises: the control device controls the second weighing device to weigh the battery to be injected; the control device controls the transfer mechanism to weigh the battery to be injected at the loading and unloading station Or the battery to be replenished at the replenishment buffer station is transferred 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 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 at the liquid preparation position, and controls the liquid injection device to vacuum 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 and 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 replenishment buffer station.

[0041] Thus, the control device controls the transfer mechanism to move the battery to be filled at the loading and unloading station to the battery placement position, or the battery to be filled at the filling buffer station to the battery placement position, and then controls the rotary device to rotate the battery placement position carrying the battery, and controls the liquid preparation mechanism to prepare the liquid for the liquid injection device to realize automatic liquid preparation. After the automatic liquid preparation is completed, the liquid injection device is controlled to inject the battery at the battery placement position before the battery placement position returns to the loading and unloading position, thereby realizing full-automatic liquid injection of the battery, improving the automation of battery liquid injection, improving production efficiency, and reducing labor costs. On the other hand, by setting a first weighing device for weighing the battery after liquid injection, and transferring the weighed battery to be filled to the filling buffer station, thereby, while improving the yield rate, automatic liquid replenishment of the battery can also be realized, further improving the automation of battery liquid injection.

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

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

[0044] The control device controls the feeding detection device to detect batteries passing through the detection area of ​​the feeding detection device, and transfers the batteries that pass the detection to the loading and unloading station, and transfers the batteries that fail the detection to the feeding buffer pull belt.

[0045] In some embodiments, the injection system includes a loading and pairing station, and the battery that passes the inspection is transferred to the loading and unloading station, and the battery that fails the inspection is transferred to the loading and buffering belt, including:

[0046] The control device transfers the battery packs that have passed the inspection to the loading and unloading station, and transfers the battery packs that have failed the inspection to the loading and pairing station, wherein the unqualified battery packs include at least one unqualified battery;

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

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

[0049] The feeding 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 test device, and the control device controls the short-circuit test device to perform a short-circuit test on batteries passing through a test area of ​​the short-circuit test device; and / or,

[0051] The feeding detection device includes a first code scanning device, and the control device controls the first code scanning device to scan the batteries passing through the code scanning area of ​​the first code scanning device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0053] Figure 2 This is a schematic structural diagram of a liquid injection fixture according to an embodiment of the present application;

[0054] Figure 3 A schematic diagram of the implementation process of the liquid injection method provided in one embodiment of the present application;

[0055] Figure 4A schematic diagram of another implementation flow of the liquid injection method provided in one embodiment of the present application;

[0056] Figure 5 A schematic diagram of another implementation flow of the liquid injection method provided in one embodiment of the present application;

[0057] Figure 6 A schematic diagram of another implementation flow of the liquid injection method provided in one embodiment of the present application.

[0058] Description of Reference Numerals

[0059] 1. Rotating device; 1a. Battery placement position; 10a. Material inlet and outlet position; 10b. Liquid preparation position; 10c. Static buffer position; 10d. Residual liquid receiving position; 2. Liquid injection fixture; 2a. Receiving 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 code scanning device; 7. Loading detection device; 71. First code scanning device; 72. Second weighing device; 73. Short circuit testing device; 8. Robot; 9. Loading pull belt; 9a. Material picking position; 11. Unloading pull belt; 11a. Unloading position; 12. Loading buffer pull belt; 13. Loading pairing station; 14. Unloading buffer pull belt; 15. Unloading pairing station; 16. Cleaning device; 17. Residual liquid receiving mechanism; 100. Liquid injection system; 200. Battery. DETAILED DESCRIPTION

[0060] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0068] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0069] With the country's vigorous promotion of new energy vehicles, new energy vehicles have ushered in a great opportunity for development. The safety and stability of automobiles have always been people's greatest concern. Therefore, improving the safety of new energy vehicles will be one of the important factors that determine whether new energy vehicles can be quickly popularized. Battery modules are the main components of the battery pack of new energy vehicles. Improving the safety of battery modules is an important way to improve the safety of new energy vehicles.

[0070] The battery mentioned in the embodiments of the present application is used to form a battery device, which includes one or more battery cells to provide a single physical module with higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, rectangular or in other shapes, etc., which is not limited in the embodiments of the present application.

[0072] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrolyte plays the role of conducting ions between the positive and negative electrode sheets. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene).

[0073] The battery cell also includes an insulating film and a shell. The insulating film is coated on the outside of the electrode assembly, and the shell encapsulates the electrode assembly coated with the insulating film to form a battery cell. The insulating film can be a Mylar film, and the shell can be an aluminum shell. After the electrode assembly is wound and formed, the Mylar film and the shell are encapsulated through the Mylar wrapping process and the shelling process. Among them, the Mylar film plays the role of sealing and protecting the electrode assembly, and the Mylar film can effectively insulate the electrode assembly and the shell from each other to avoid internal short circuits in the battery cell. The shell plays a protective role.

[0074] After the shelling process, a liquid injection process is usually carried out to inject electrolyte into the shell. The liquid injection process is an important link in the battery manufacturing process, and the injection accuracy is directly related to the cycle performance, safety performance, consistency, etc. of lithium ions. In the related art, the liquid injection equipment has a low degree of automation, low production efficiency, and high labor costs. It should be noted that the battery in the liquid injection process can be an intermediate state before forming a finished battery cell in the battery device.

[0075] In order to improve the degree of automation and production efficiency and reduce labor costs, please refer to Figure 1 and Figure 2, an embodiment of the present application provides a liquid injection system for injecting liquid into a battery 200, and the liquid injection system 100 includes a rotary device 1, a liquid injection device, a liquid preparation mechanism 3, a loading and unloading station 4, a liquid replenishment buffer station 5, a transfer mechanism, a first weighing device 61, a second weighing device 72, and a control device. The rotary device 1 is provided with a plurality of battery placement positions 1a, and the plurality of battery placement positions 1a are arranged along the circumferential direction and can be rotated and shifted, and the battery placement positions 1a are used to place batteries 200. Each battery placement position 1a passes through the material inlet and outlet position 10a, the liquid preparation position 10b, at least one static buffer position 10c in sequence through rotation and shifting, and returns to the material inlet and outlet position 10a. Each battery placement position 1a is respectively equipped with a liquid injection device, and the liquid injection device is configured to inject liquid into the battery 200 on the battery placement position 1a. The liquid preparation mechanism 3 is arranged on the outer side of the rotating device 1, and the liquid preparation mechanism 3 is configured to prepare liquid for the liquid injection device equipped at the battery placement position 1a located at the liquid preparation position (that is, the liquid injection device passing through the liquid preparation area of ​​the liquid preparation mechanism 3). The loading and unloading station 4 is arranged on the outer side of the rotating device 1, and the loading and unloading station 4 is configured to place the battery 200 to be injected and the battery 200 after injection. The liquid replenishment buffer station 5 is configured to buffer the battery 200 to be replenished. The transfer mechanism is configured to move the battery 200 after injection from the battery placement position 1a located at the inlet and outlet position 10a to the loading and unloading station 4, and move the battery 200 to be injected from the loading and unloading station 4 to the battery placement position 1a located at the inlet and outlet position 10a, or, move the battery 200 to be replenished from the liquid replenishment buffer station 5 to the battery placement position 1a located at the inlet and outlet position 10a. The second weighing device 72 is configured to weigh the battery 200 to be injected. The first weighing device 61 is configured to weigh the battery 200 after injection. The control device is configured to control the second weighing device 72 to weigh the battery to be injected, and then control the transfer mechanism to move the battery 200 to be injected located at the loading and unloading station 4 to the battery placement position 1a located at the inlet and outlet position 10a, control the rotary device 1 to rotate and shift the battery placement position 1a, and control the liquid preparation mechanism 3 to prepare the liquid injection device equipped at the battery placement position 1a shifted to the liquid preparation position 10b, and control the liquid injection device after preparation to inject the battery 200 on the battery placement position 1a before the battery placement position 1a rotates back to the inlet and outlet position 10a. The control device controls the transfer mechanism to move the injected battery 200 that is rotated back to the loading and unloading position 10a from the battery placement position 1a to the loading and unloading station 4, and then controls the first weighing device 61 to weigh the injected battery 200, and after weighing, the battery 200 to be replenished is transferred to the replenishment buffer station 5, and then further controls the transfer mechanism to move the battery 200 to be replenished in the replenishment buffer station 5 to the battery placement position 1a located at the loading and unloading position 10a and where no battery 200 is placed.

[0076] Exemplarily, the rotary device 1 is provided with at least two battery placement positions (stationary positions) 1a, each of which is arranged at intervals along the circumference of the rotary device 1, and the battery placement positions 1a are configured to install a liquid injection fixture 2 for accommodating a battery 200, so as to perform steps such as vacuuming and stationary on the battery 200 on the liquid injection fixture 2. Each battery placement position 1a is arranged at intervals along the circumference of the rotary device 1, so that the rotary device 1 can rotate to drive the liquid injection fixture 2 in the battery placement position 1a to flow along the circumference of the rotary device 1, so as to realize the scheduling of the battery placement position 1a, thereby performing different steps and finally completing the liquid injection.

[0077] The fact that the rotary device 1 is 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 performing loading and unloading, liquid preparation, vacuuming and standing of the battery 200, the injection device located on the remaining battery placement positions 1a can inject liquid into the battery 200, for example, performing positive and negative pressure cycle injection on the battery 200, which is conducive to full absorption of the electrolyte, saving time and improving production efficiency. Here, for the sake of convenience, the position where the battery placement position 1a is located when the battery 200 on the battery placement position can be loaded and unloaded can be called the loading and unloading position, the position where the battery placement position 1a is located when the injection device on the battery placement position can perform liquid injection (including vacuuming) can be called the liquid preparation position, and the position where the battery placement position 1a rotates through after passing the liquid preparation position can be called the static buffer position. It should be noted that the multiple described in the embodiments of the present application refers to a number of two or more than two.

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

[0080] In some embodiments, see Figure 1 and Figure 2 The injection system 100 includes an injection fixture 2. The injection fixture 2 is configured to accommodate a battery 200 to be injected or replenished, and the transfer mechanism is used to move the injection fixture 2 containing the battery 200 to be injected or replenished to the battery placement position 1a. The injection fixture 2 can also accommodate the battery 200 after injection, and is used to move the battery after injection from the battery placement position to the loading and unloading station 4. The battery placement position 1a can be the position where the injection fixture 2 is placed.

[0081] The injection fixture 2 refers to a structure for accommodating the battery 200 and can position the battery 200. During the injection process, the receiving groove 2a of the injection fixture 2 is used to carry the battery 200, and different mechanisms of the injection system 100 perform different treatments on the battery 200. Different batteries 200 may require different injection fixtures 2, so different injection fixtures 2 can be replaced for different types of batteries 200 to carry the battery 200.

[0082] Exemplarily, the slewing device 1 comprises a mounting bracket, a turntable rotatably disposed on the mounting bracket, and a driving member for driving the turntable to rotate. In some embodiments, the slewing device 1 is also called a turret.

[0083] Here, the turntable is driven by a driving member to rotate horizontally, and the direction of rotation of the turntable can be counterclockwise or clockwise. The battery placement position 1a can be a position on the turntable where a battery can be placed (a battery is placed by the injection fixture 2). The turntable is driven by the driving member to rotate, so that the battery placement position 1a of the rotating device 1 rotates.

[0084] Exemplarily, the driving member is, for example, a motor.

[0085] Exemplarily, each battery placement position 1a is provided with a corresponding liquid injection device, and the liquid injection device 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 at the liquid reserve position.

[0086] 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. Exemplarily, the control device controls the battery placement position 1a where the battery 200 to be injected is placed to rotate to the liquid preparation position. The liquid injection device corresponding to the battery placement position 1a is located in the liquid preparation area. The control device controls the liquid preparation mechanism 3 to inject a certain amount of electrolyte into the liquid injection cup of the liquid injection device, and the liquid injection cup is used to inject the battery 200. Exemplarily, the liquid injection device can use positive and negative pressure cycles to inject liquid.

[0087] The loading and unloading station 4 is configured to place batteries 200 to be injected and batteries 200 after injection, that is, the loading and unloading station 4 is used to place the injection fixture 2, and the injection fixture 2 is used to accommodate batteries 200 to be injected or batteries 200 to be replenished, or, is used to place the injection fixture 2 for accommodating batteries 200 after injection.

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

[0089] See also Figure 1The first weighing device 61 is configured to weigh the battery 200 after liquid injection, so as to confirm whether the liquid injection amount of the battery 200 meets the standard. If there is less liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5. If there is more liquid, the unqualified battery 200 is transferred to the unloading buffer pull belt 14. If the liquid injection amount meets the standard, the qualified battery 200 is transported to the next process, thereby realizing automatic liquid replenishment of the battery 200.

[0090] Optionally, the first weighing device 61 may be provided in the material 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 liquid injection system of the embodiment of the present application, on the one hand, controls the transfer mechanism by the control device to move the battery 200 to be injected at the loading and unloading station 4 to the battery placement position 1a, or moves the battery 200 to be injected at the liquid replenishment buffer station 5 to the battery placement position 1a, and then controls the rotation device 1 to rotate, and controls the liquid preparation mechanism 3 to prepare the liquid for the liquid injection device to realize automatic liquid preparation. After the automatic liquid preparation is completed, the liquid injection device is controlled to complete the liquid injection of the battery 200 on the battery placement position 1a before rotating back to the loading and unloading station, thereby realizing full-automatic liquid injection of the battery 200, improving the automation of liquid injection of the battery 200, improving production efficiency, and reducing labor costs. On the other hand, by setting a first weighing device 61, it is used to weigh the battery 200 after liquid injection, and transfer the weighed battery 200 to be injected to the liquid replenishment buffer station 5, thereby, while improving the yield rate, it can also realize automatic liquid replenishment of the battery 200, further improving the automation of liquid injection of the battery 200.

[0092] In some embodiments, see Figure 1 and Figure 2 The injection system 100 includes a robot 8, a loading belt 9 with a material taking position 9a, and a unloading belt 11 with a material unloading position 11a. The control device can control the robot 8 to transfer the qualified battery 200 at the material taking position 9a to the loading and unloading station 4, and transfer the battery 200 after injection at the loading and unloading station 4 to the unloading position 11a.

[0093] It should be noted that the specific type and position of the robot 8 are not limited here, as long as it can transfer the qualified batteries 200 at the material taking position 9a to the loading and unloading station 4, and transfer the batteries 200 after liquid injection at the loading and unloading station 4 to the unloading position 11a. Of course, the robot 8 can also have other functions.

[0094] Here, the loading pull belt 9 is used to load the battery 200. Exemplarily, the loading pull belt 9 includes a first end and a second end along the conveying direction. The first end of the loading pull belt 9 is the feeding end, and the second end of the loading pull belt 9 is the material collection position 9a. The battery 200 to be injected with liquid enters from the feeding end, and the loading pull belt 9 transports the battery 200 to be injected with liquid to the material collection position 9a.

[0095] Here, the unloading belt 11 is used to unload the battery 200. Exemplarily, the unloading belt 11 includes a first end and a second end along the conveying direction. The first end of the unloading belt 11 is the unloading position 11a, and the second end of the unloading belt 11 is the discharge end. The battery 200 filled with liquid enters from the unloading position 11a, and the unloading belt 11 conveys the battery 200 filled with liquid to the discharge end.

[0096] See also Figure 1 and Figure 2 The robot 8 transfers the qualified battery 200 at the material taking position 9a to the loading and unloading station 4, for example, the qualified battery 200 at the material taking position 9a is transferred to the injection fixture 2 on the loading and unloading station 4. The battery 200 after injection at the loading and unloading station 4 is transferred to the unloading position 11a, for example, the battery 200 after injection at the loading and unloading station 4 is transferred to the injection fixture 2 on the unloading position 11a.

[0097] Exemplarily, the robot 8 is a six-axis robot 8. Compared with coordinate axis loading and unloading, the six-axis robot 8 has high flexibility and is more stable and reliable during the transfer process. By setting the robot 8, it is used to transfer the qualified battery 200 at the material taking position 9a to the loading and unloading station 4, and transfer the battery 200 after liquid injection at the loading and unloading station 4 to the unloading position 11a, which is conducive to realizing the automatic operation of the machine and reducing the labor cost.

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

[0099] In this embodiment, the feeding detection device 7 is provided to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7, which is helpful to timely find out whether the batteries 200 to be injected are qualified, thereby improving the production efficiency of the batteries 200.

[0100] In some embodiments, see Figure 1 The feeding detection device 7 includes a first code scanning device 71. The control device can control the first code scanning device 71 to scan the battery 200 passing through the code scanning area of ​​the first code scanning device 71.

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

[0102] The first code scanning device 71 is disposed on one side of the loading drawstring 9 , which is conducive to scanning the battery 200 passing through the code scanning area of ​​the first code scanning device 71 .

[0103] In this embodiment, a first code scanning device 71 is provided to automatically scan the battery 200, which is helpful to identify and bind the information of the battery 200, so as to realize tracking and recording of the battery 200 during the entire injection process, thereby improving the reliability of the injection.

[0104] In some embodiments, please refer to Figure 1 The feeding detection device 7 includes a second weighing device 72. The control device can control the second weighing device 72 to weigh the battery 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 disposed on one side of the loading belt 9, which is conducive to weighing the battery 200 passing through the weighing area of ​​the second weighing device 72 to obtain the weight of the battery 200 before liquid injection.

[0107] In this embodiment, a second weighing device 72 is provided for automatically weighing the battery 200, so as to obtain the weight of the battery 200 before liquid injection, and then the battery 200 after liquid injection is weighed by the first weighing device 61. The same battery 200 is weighed by the first weighing device 61 and the second weighing device 72, and the weight of the battery 200 after liquid injection weighed by the first weighing device 61 is subtracted from the weight of the battery 200 before liquid injection weighed by the second weighing device 72 to obtain the liquid injection amount of the battery 200, so as to confirm whether the liquid injection amount of the battery 200 meets the standard. If there is less liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5; if there is more liquid, the unqualified battery 200 is transferred to the unloading buffer draw belt 14; if the liquid injection amount meets the standard, the qualified battery 200 is transported to the next process, so as to realize automatic liquid replenishment of the battery 200 and improve the reliability of liquid injection of the battery 200 and the yield rate of the battery 200. In addition, the battery 200 can be automatically replenished, further improving the automation level of the battery 200 injection.

[0108] In the related art, the battery needs to be baked before liquid injection. After the battery is baked, the pole pieces become fluffy, some batteries have internal short circuits, and the batteries are not short-circuited before liquid injection, resulting in the problem of defective products flowing to the terminal. Batteries with internal short circuits cannot be identified after liquid injection, so it is necessary to pick out batteries with internal short circuits in advance before liquid injection.

[0109] In some embodiments, see Figure 1 The feeding detection device 7 includes a short circuit test device 73. The control device can control the short circuit test device 73 to perform a short circuit test (Hi-pot, high potential) on the battery 200 passing through the test area of ​​the short circuit test 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 an automatic short-circuit test on the battery 200.

[0111] The short-circuit test device 73 is disposed on one side of the loading pull belt 9 , which is conducive to implementing a short-circuit test on the battery 200 passing through the test area of ​​the short-circuit test device 73 .

[0112] In this embodiment, a short-circuit test device 73 is provided to perform an automatic short-circuit test on the battery 200, which is beneficial for timely picking out batteries 200 with internal short circuit problems before liquid injection, improving the problem of defective products flowing to the terminal, and improving the yield of the battery 200.

[0113] Exemplarily, the first code scanning device 71 , the second weighing device 72 and the short circuit testing device 73 are arranged in sequence along the conveying direction of the feeding pull belt 9 .

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

[0115] In some embodiments, see Figure 1 The injection system 100 includes a loading and caching belt 12 , and the control device can control the robot 8 to transfer the unqualified batteries 200 detected by the loading and caching detection device 7 to the loading and caching belt 12 .

[0116] Exemplarily, the unqualified battery 200 after the test is, for example, a product with poor code scanning or a battery 200 with an internal short circuit problem.

[0117] The loading buffer pull belt 12 can be arranged between the loading pull belt 9 and the unloading pull belt 11 .

[0118] In this embodiment, a loading buffer pull belt 12 is provided to buffer unqualified batteries 200, without stopping the line for processing, and without causing the problem of defective products flowing to the terminal, which is conducive to improving the degree of automation and production efficiency.

[0119] In some embodiments, please refer to Figure 1 The injection system 100 includes a loading and pairing station 13. The control device can control the robot 8 to transfer the unqualified battery pack detected by the loading detection device 7 to the loading and pairing station 13. The unqualified battery pack includes at least one unqualified battery 200. The control device can control the robot 8 to transfer the unqualified battery 200 on the loading and pairing station 13 to the loading and buffering drawstring 12, and transfer the qualified battery 200 on the loading and pairing station 13 to the loading and unloading station 4.

[0120] It is understandable that the robot 8 can transfer multiple batteries 200 each time, such as 4, 5, 6, 7, 8, 9, 10, etc. Thus, multiple batteries can be grouped together, which is beneficial for the robot 8 to grasp and transfer.

[0121] In this embodiment, by setting a loading and pairing station 13, when the robot 8 grabs the battery 200, when there is an unqualified battery 200 in the battery pack, the robot 8 transfers the unqualified battery pack to the loading and pairing station 13, and then puts the unqualified battery 200 in the battery pack into the loading buffer drawstring 12. When the entire battery pack is qualified, the entire battery pack is placed in the liquid filling fixture 2. When the number of batteries 200 on the loading and pairing station 13 meets the number of batteries 200 that the robot 8 can grab at a single time, the robot 8 gives priority to grabbing the batteries 200 on the pairing mechanism and placing them in the liquid filling fixture 2, which is beneficial to vacating the loading and pairing station 13 and to improving the efficiency of the robot 8 in filling the liquid filling fixture 2.

[0122] Of course, in other embodiments, when there are unqualified batteries 200 in the battery pack, the robot 8 places the unqualified batteries 200 in the battery pack onto the loading buffer pull belt 12, and transfers the qualified batteries 200 on the loading pairing station 13 to the loading and unloading station 4, without waiting until the number of batteries 200 on the loading pairing station 13 meets the single-grabbing quantity of the robot 8 before grabbing.

[0123] In some embodiments, please refer to Figure 1 The liquid injection system includes a material unloading detection device 6, which includes the above-mentioned first weighing device 61 and a second code scanning device 62 arranged on one side of the unloading drawstring 11. The control device can control the second code scanning device 62 to scan the battery 200 passing through the code scanning area of ​​the second code scanning device 62.

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

[0125] The first weighing device 61 and the second code scanning device 62 are arranged on one side of the unloading drawstring 11 , which is beneficial to weighing the batteries 200 passing through the weighing area and scanning the batteries 200 passing through the code scanning area of ​​the second code scanning device 62 during the unloading process.

[0126] In this embodiment, a second scanning device 62 is provided to automatically scan the battery 200 after injection, which is helpful to identify and bind the information of the battery 200 after injection, so as to realize the tracking and recording of the battery 200 in the whole injection process and improve the reliability of injection.

[0127] In some embodiments, please refer to Figure 1 The injection system 100 includes a material unloading buffer pull belt 14 , and the control device can control the robot 8 to transfer the unqualified batteries 200 detected by the unloading detection device 6 to the material unloading buffer pull belt 14 .

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

[0129] Exemplarily, unqualified batteries 200 detected by the unloading detection device 6 are, for example, products with poor code scanning or batteries 200 with excess liquid after liquid injection.

[0130] In this embodiment, a material unloading buffer pull belt 14 is provided to buffer unqualified batteries 200 after liquid injection, without stopping the line for processing, and without causing the problem of defective products flowing to the terminal, which is conducive to improving the degree of automation and production efficiency.

[0131] In some embodiments, please refer to Figure 1 The injection system 100 includes a material unloading pairing station 15. The control device can control the robot 8 to transfer the unqualified battery pack detected by the unloading detection device 6 to the material unloading pairing station 15. The unqualified battery pack includes at least one unqualified battery 200. The control device can control the robot 8 to transfer the battery 200 to be replenished on the material unloading pairing station 15 to the replenishment buffer station 5, transfer the unqualified battery 200 other than the battery to be replenished to the material unloading buffer drawstring 14, and transfer the qualified battery 200 on the material unloading pairing station 15 to the material unloading drawstring 11.

[0132] In this embodiment, by setting up a material unloading pairing station 15, when the robot 8 grabs the battery 200, when a battery group contains an unqualified battery 200, the robot 8 transfers the unqualified battery group to the material unloading pairing station 15, and transfers the battery 200 to be replenished in the battery group to the replenishment buffer station 5, and then transfers the unqualified batteries 200 in the battery group other than those to be replenished (for example, products with poor code scanning or batteries 200 with excess liquid after injection) to the material unloading buffer drawstring 14. When the number of batteries 200 on the material unloading pairing station 15 meets the number of batteries 200 that can be grabbed by the robot 8 at a single time, the robot 8 gives priority to grabbing the batteries 200 on the material unloading pairing station 15 and inserting the material unloading drawstring, which is beneficial to vacating the material unloading pairing station 15 and to improving the grabbing efficiency of the robot 8. When the number of batteries 200 on the refilling buffer station 5 meets the number of batteries that can be grasped by the robot 8 at a single time, the robot 8 preferentially grasps the batteries 200 on the refilling buffer station 5 and places them into the liquid injection fixture 2 at the battery placement position 1a.

[0133] Of course, in other embodiments, when there are unqualified batteries 200 in the battery pack, the robot 8 places the unqualified batteries 200 in the battery pack on the unloading buffer drawstring 14, and transfers the qualified batteries 200 on the unloading pairing station 15 to the unloading pull line, without waiting until the number of batteries 200 on the unloading pairing station 15 meets the single grabbing number of the robot 8 before grabbing. It is also not necessary to wait until the number of batteries 200 on the rehydration buffer station 5 meets the single grabbing number of the robot 8 before grabbing the batteries 200 on the rehydration buffer station 5 and placing them in the injection fixture 2 of the battery placement position 1a.

[0134] In some embodiments, please refer to Figure 1 The injection system 100 includes a cleaning device 16 disposed on one side of the unloading belt 11 , and the control device can control the cleaning device 16 to clean the battery 200 passing through the cleaning area of ​​the cleaning device 16 .

[0135] In this embodiment, by setting a cleaning device 16 on one side of the unloading pull belt 11, after the injection of the electrolyte is completed, the control device can control the cleaning device 16 to wipe the injection port of the battery 200 passing through the cleaning area of ​​the cleaning device 16 to wipe off the electrolyte residue outside the injection port.

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

[0137] In some embodiments, please refer to Figure 1 The liquid injection system 100 includes at least two rotating devices 1.

[0138] The liquid injection system 100 includes at least two rotating devices 1, which means that the liquid injection system 100 includes a plurality of rotating devices 1. In the embodiment of the present application, the liquid injection system 100 includes two rotating devices 1 (may include two turrets) as an example for description.

[0139] Exemplarily, the fully automatic liquid injection system 100 of the embodiment of the present application can achieve a maximum output of 16 PPM (16 products per minute) for a single machine.

[0140] In this embodiment, the liquid injection system 100 is provided with two rotating devices 1, which is beneficial to improving the liquid injection efficiency of the battery 200. The two rotating devices 1 can share the loading belt 9, the unloading belt 11 and the robot 8, which improves the liquid injection efficiency while reducing the number of parts and reducing costs.

[0141] In some embodiments, see Figure 1 The liquid injection system 100 includes a residual liquid receiving mechanism 17 disposed on the outer side of the rotating device 1 in a circumferential direction, and the control device can control 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 where the battery placement position 1a is able to clean the residual liquid is called the residual liquid receiving position. Each battery placement position 1a passes through the material inlet and outlet position 10a, the reserve liquid position 10b, at least one static buffer position 10c, the residual liquid receiving position 10d in sequence through rotational displacement and returns to the material inlet and outlet position 10a. The control device controls the residual liquid receiving mechanism 17 to clean the residual electrolyte in the liquid injection cup of the liquid injection device for the battery placement position 1a located at the residual liquid 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 injection cup of the injection device, thereby improving the problem of inaccurate injection amount of the next round of batteries 200 caused by the residual electrolyte in the injection cup. In addition, the residual liquid receiving mechanism 17 can also be used to hold the residual electrolyte, which can improve the problem of electrolyte dripping on the outside of the residual liquid receiving mechanism 17, which is conducive to maintaining cleanliness and hygiene.

[0144] The present application embodiment provides a liquid injection method, which is applied to a liquid injection system 100 for injecting liquid into a battery 200. Figure 1 to Figure 2 As shown, the liquid injection system 100 includes a control device, a rotating device 1, a liquid injection device, a liquid preparation mechanism 3, a loading and unloading station 4, a liquid replenishment buffer station 5, a transfer mechanism, a first weighing device 61 and a second weighing device 72.

[0145] Figure 3 A schematic diagram of a flow chart of a liquid injection method provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the liquid 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] Step S302, the control device controls the transfer mechanism to transfer the batteries to be filled at the loading and unloading station or the batteries to be filled at the filling buffer station to the battery placement position of the rotary device.

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

[0149] See also Figure 1 The loading and unloading station 4 is arranged on the outer side of the rotary device 1 in the circumferential direction, and the loading and unloading station 4 is configured to place the battery 200 to be filled with liquid and the battery 200 after the liquid filling. The liquid filling buffer station 5 is configured to buffer the battery 200 to be filled with liquid. The transfer mechanism is configured to move the battery 200 after the liquid filling on the battery placement position 1a to the loading and unloading station 4, and move the battery 200 to be filled with liquid on the loading and unloading station 4 to the battery placement position 1a, or, move the battery 200 to be filled with liquid on the liquid filling buffer station 5 to the battery placement position 1a.

[0150] See also Figure 1 The rotary device 1 is provided with at least two battery placement positions 1a, each of which is arranged at intervals along the circumference of the rotary device 1. The battery placement positions 1a are configured to install a liquid injection fixture 2 for accommodating a battery 200, so as to perform steps such as vacuuming and standing the battery 200 on the liquid injection fixture 2. Each battery placement position 1a is arranged at intervals along the circumference of the rotary device 1. In this way, the rotary device 1 can rotate to drive the liquid injection fixture 2 in the battery placement position 1a to flow along the circumference of the rotary device 1, so as to realize the scheduling of the battery placement position 1a, thereby performing different steps and finally completing the liquid injection.

[0151] The fact that the rotary device 1 is 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 the present application refers to a number of two or more than two.

[0153] In some embodiments, see Figure 1 and Figure 2 The injection system 100 includes an injection fixture 2. The injection fixture 2 is configured to accommodate a battery 200 to be injected or replenished, and the transfer mechanism is used to move the injection fixture 2 accommodating the battery 200 to be injected or replenished to the battery placement position 1a.

[0154] The injection fixture 2 refers to a structure for accommodating the battery 200 and can position the battery 200. During the injection process, the receiving groove 2a of the injection fixture 2 is used to carry the battery 200, and different mechanisms of the injection system 100 perform different treatments on the battery 200. Different batteries 200 may require different injection fixtures 2, so different injection fixtures 2 can be replaced for different types of batteries 200 to carry the battery 200.

[0155] Exemplarily, the rotating device 1 (eg, a turret) includes a mounting bracket, a turntable rotatably disposed on the mounting bracket, and a driving member for driving the turntable to rotate.

[0156] Here, the turntable is driven by a driving member to rotate horizontally, and the rotation direction of the turntable can be counterclockwise or clockwise. The turntable is driven by the driving member to rotate, so that the battery placement position 1a rotates.

[0157] Exemplarily, the driving member is, for example, a motor.

[0158] 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 liquid preparation position, the control device controls the liquid preparation mechanism to prepare liquid for the injection device equipped at the battery placement position located at the liquid preparation position, and controls the injection device to vacuum the battery.

[0159] Exemplarily, the control device controls the driving member of the rotating device to drive the turntable to rotate, and as the turntable rotates, the battery placement position 1a rotates.

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

[0161] The liquid preparation mechanism 3 is configured to prepare liquid for a liquid injection device (at this time, the battery placement position 1a is located at the liquid preparation position) passing through the liquid preparation area of ​​the liquid preparation mechanism 3. Exemplarily, 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 liquid injection cup of the liquid injection device, and the liquid injection cup is used to inject liquid into the battery 200.

[0162] Here, while the control device 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] Step S304, in response to the completion of the 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 material inlet and outlet position 10a.

[0164] In this way, the liquid injection can be completed while the battery placement position 1a is rotated from the material inlet and outlet position 10a back to the material inlet and outlet position 10a. For example, the liquid injection can be completed at the liquid preparation position, or the liquid preparation can be completed while the battery 200 is rotated through the static buffer position after the liquid preparation. By setting at least two battery placement positions 1a, while the loading and unloading station 4 is performing the loading and unloading, liquid preparation, vacuuming and static of the battery 200, the liquid injection device located on the remaining battery placement positions 1a can inject liquid into the battery 200, for example, perform positive and negative pressure circulation liquid injection on the battery 200, which is conducive to the full absorption of the electrolyte, saving time and improving production efficiency.

[0165] Step S305, in response to the completion of the liquid injection, the control device controls the first weighing device 61 to weigh the liquid-injected batteries that have been moved out of the battery placement position 1a, and transfers the weighed batteries to be filled to the liquid filling buffer station.

[0166] Optionally, the unloading detection device 6 is used to detect the battery 200 after liquid injection to detect whether the battery 200 is qualified.

[0167] See also 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, so as to confirm whether the liquid injection amount of the battery 200 meets the standard. If there is less liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5; if there is more liquid, the unqualified battery 200 is transferred to the unloading buffer pull belt 14; if the liquid injection amount meets the standard, the qualified battery 200 is transported 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 battery after liquid injection that has been moved out of 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, confirm whether the liquid injection amount of the battery 200 meets the standard; if there is less liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5; if there is more liquid, the unqualified battery 200 is transferred to the unloading buffer pull belt 14; if the liquid injection amount meets the standard, the qualified battery 200 is transported to the next process for subsequent processing.

[0170] The liquid injection method of the embodiment of the present application, on the one hand, controls the transfer mechanism by a control device to move the battery 200 to be injected at the loading and unloading station 4 to the battery placement position 1a, or moves the battery 200 to be injected at the injection buffer station 5 to the battery placement position 1a, and then controls the rotation of the rotary device 1, and controls the liquid preparation mechanism 3 to prepare the liquid for the liquid injection device to realize automatic liquid preparation. After the automatic liquid preparation is completed, the liquid injection device is controlled to inject the battery 200 on the battery placement position 1a before the battery placement position 1a returns to the input and output position 10a, thereby realizing fully automatic liquid injection of the battery 200, improving the degree of automation 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, it is used to weigh the battery 200 after liquid injection, and transfer the weighed battery 200 to be replenished to the replenishment buffer station 5. Therefore, while improving the yield rate, automatic replenishment of the battery 200 can also be achieved, further improving the degree of automation of battery 200 injection.

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

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

[0173] Step S321, the control device controls the loading belt to transport the batteries to be injected with liquid.

[0174] Step S322, 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 batteries that pass the detection to the loading and unloading stations, and transfers the batteries that fail the detection to the feeding buffer pull belt.

[0175] After step S321 and step S322, step S302 is performed, where the control device controls the transfer mechanism to transfer the batteries to be filled at the loading and unloading stations or the batteries to be filled at the filling buffer station to the battery placement position of the rotary device.

[0176] Here, the loading pull belt 9 is used to load the battery 200. Exemplarily, the loading pull belt 9 includes a first end and a second end along the conveying direction. The first end of the loading pull belt 9 is the feeding end, and the second end of the loading pull belt 9 is the material collection position 9a. The battery 200 to be injected with liquid enters from the feeding end, and the loading pull belt 9 transports the battery 200 to be injected with liquid to the material collection position 9a.

[0177] The robot 8 transfers the qualified battery 200 at the material taking position 9a to the loading and unloading station 4, for example, transferring the qualified battery 200 at the material taking position 9a to the injection fixture 2 on the loading and unloading station 4. The battery 200 after injection at the loading and unloading station 4 is transferred to the unloading position 11a, for example, transferring the battery 200 after injection at the loading and unloading station 4 to the injection fixture 2 on the unloading position 11a.

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

[0179] In this embodiment, the feeding detection device 7 is provided to detect the batteries 200 passing through the detection area of ​​the feeding detection device 7, which is helpful to timely find out whether the batteries 200 to be injected are qualified, thereby improving the production efficiency of the batteries 200.

[0180] In some embodiments, see Figure 1 The injection system 100 includes a loading and caching belt 12 , and the control device can control the robot 8 to transfer the unqualified batteries 200 detected by the loading and caching detection device 7 to the loading and caching belt 12 .

[0181] Exemplarily, the unqualified battery 200 after the test is, for example, a product with poor code scanning or a battery 200 with an internal short circuit problem.

[0182] In this embodiment, a loading buffer pull belt 12 is provided to buffer unqualified batteries 200, without stopping the line for processing, and without causing the problem of defective products flowing to the terminal, which is conducive to improving the degree of automation and production efficiency.

[0183] In some embodiments, see Figure 1 The liquid injection system 100 includes a loading and pairing station 13.

[0184] The battery 200 that has passed the test is transferred to the loading and unloading station 4 (step S3221), and the battery 200 that has failed the test is transferred to the loading and caching belt 12 (step S3222), which may include the following steps:

[0185] The control device transfers the battery packs that have passed the test to the loading and unloading station 4 (step S3221), and transfers the battery packs that have failed the test to the loading and pairing station 13 (step S3222a), wherein the unqualified battery packs include at least one unqualified battery 200;

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

[0187] It is understandable that the robot 8 can transfer multiple batteries 200 each time, such as 4, 5, 6, 7, 8, 9, 10, etc. Thus, multiple batteries can be grouped together, which is beneficial for the robot 8 to grasp and transfer.

[0188] In this embodiment, by setting a loading and pairing station 13, when the robot 8 grabs the battery 200, when there is an unqualified battery 200 in the battery pack, the robot 8 transfers the unqualified battery pack to the loading and pairing station 13, and then puts the unqualified battery 200 in the battery pack into the loading buffer drawstring 12. When the entire battery pack is qualified, the entire battery pack is placed in the liquid filling fixture 2. When the number of batteries 200 on the loading and pairing station 13 meets the number of batteries 200 that the robot 8 can grab at a single time, the robot 8 gives priority to grabbing the batteries 200 on the pairing mechanism and placing them in the liquid filling fixture 2, which is beneficial to vacating the loading and pairing station 13 and to improving the efficiency of the robot 8 in filling the liquid filling fixture 2.

[0189] Of course, in other embodiments, when there are defective products, the robot 8 places the unqualified batteries 200 in the battery pack onto the loading buffer pull belt 12, and transfers the qualified batteries 200 on the loading pairing station 13 to the loading and unloading station 4, without waiting until the number of batteries 200 on the loading pairing station 13 meets the single grabbing quantity of the robot 8 before grabbing.

[0190] In some embodiments, see Figure 1 The control device controls the feeding detection device 7 to detect the battery 200 passing through the detection area of ​​the feeding detection device 7, including:

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

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

[0193] The first code scanning device 71 is disposed on one side of the loading drawstring 9 , which is conducive to scanning the battery 200 passing through the code scanning area of ​​the first code scanning device 71 .

[0194] In this embodiment, a first code scanning device 71 is provided to automatically scan the battery 200, which is helpful to identify and bind the information of the battery 200, so as to realize tracking and recording of the battery 200 during the entire injection process, thereby improving the reliability of the injection.

[0195] In some embodiments, see Figure 1 The feeding detection device 7 includes a second weighing device 72. The control device can control the second weighing device 72 to weigh the battery 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 disposed on one side of the loading belt 9, which is conducive to weighing the battery 200 passing through the weighing area of ​​the second weighing device 72 to obtain the weight of the battery 200 before liquid injection.

[0198] In this embodiment, a second weighing device 72 is provided for automatically weighing the battery 200, so as to obtain the weight of the battery 200 before liquid injection, and then the battery 200 after liquid injection is weighed by the first weighing device 61. The same battery 200 is weighed by the first weighing device 61 and the second weighing device 72, and the weight of the battery 200 after liquid injection weighed by the first weighing device 61 is subtracted from the weight of the battery 200 before liquid injection weighed by the second weighing device 72 to obtain the liquid injection amount of the battery 200, so as to confirm whether the liquid injection amount of the battery 200 meets the standard. If there is less liquid, the unqualified battery 200 is transferred to the liquid replenishment buffer station 5; if there is more liquid, the unqualified battery 200 is transferred to the unloading buffer draw belt 14; if the liquid injection amount meets the standard, the qualified battery 200 is transported to the next process, so as to realize automatic liquid replenishment of the battery 200 and improve the reliability of liquid injection of the battery 200 and the yield rate of the battery 200. In addition, the battery 200 can be automatically replenished, further improving the automation level of the battery 200 injection.

[0199] In the related art, the battery needs to be baked before liquid injection. After the battery is baked, the pole pieces become fluffy, some batteries have internal short circuits, and the batteries are not short-circuited before liquid injection, resulting in the problem of defective products flowing to the terminal. Batteries with internal short circuits cannot be identified after liquid injection, so it is necessary to pick out batteries with internal short circuits in advance before liquid injection.

[0200] In some embodiments, see Figure 1 The feeding detection device 7 includes a short circuit test device 73. The control device can control the short circuit test device 73 to perform a short circuit test (Hi-pot, high potential) on the battery 200 passing through the test area of ​​the short circuit test 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 an automatic short-circuit test on the battery 200.

[0202] The short-circuit test device 73 is disposed on one side of the loading pull belt 9 , which is conducive to implementing a short-circuit test on the battery 200 passing through the test area of ​​the short-circuit test device 73 .

[0203] In this embodiment, a short-circuit test device 73 is provided to perform an automatic short-circuit test on the battery 200, which is beneficial for timely picking out batteries 200 with internal short circuit problems before liquid injection, improving the problem of defective products flowing to the terminal, and improving the yield of the battery 200.

[0204] Exemplarily, the first code scanning device 71 , the second weighing device 72 and the short circuit testing device 73 are arranged in sequence along the conveying direction of the feeding pull belt 9 .

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

[0206] The following is an implementation process of a liquid injection method provided in an embodiment of the present application, and the liquid injection method includes the following steps S801 to S816:

[0207] Step S801, the loading belt conveys the batteries to be injected with liquid.

[0208] Step S802, scanning and weighing the battery to be injected, and determining whether the battery to be injected is qualified.

[0209] If not, go to step S803; if so, go to step S804.

[0210] Step S803, transferring unqualified batteries to the loading buffer pull belt for manual processing.

[0211] Step S804, performing a Hi-pot test on the battery to be injected with liquid, and determining whether the battery to be injected with liquid is qualified.

[0212] If not, go to step S803; if so, go to step S805.

[0213] Step S805, transferring the battery to the injection fixture of the loading and unloading station.

[0214] Step S806: The control device controls the transfer mechanism to transfer the injection fixture of the loading and unloading station to the rotary device.

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

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

[0217] Among them, step S807 and step S808 can be performed simultaneously.

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

[0219] The battery is filled by positive and negative pressure cycles.

[0220] Step S810: the control device controls the residual liquid receiving mechanism to inject liquid into the battery.

[0221] Step S811, the control device controls the transfer mechanism to transfer the injection fixture on the rotary device to the loading and unloading station.

[0222] Step S812, transferring the batteries filled with liquid in the liquid filling fixture to the unloading pull belt.

[0223] Step S813, scanning and weighing the batteries after filling, and determining whether the batteries to be filled are qualified.

[0224] If not, go to step S814; if so, go to step S815.

[0225] Step S814, transferring the unqualified batteries to the refilling buffer station for automatic refilling.

[0226] If multiple refills fail, the unqualified batteries will be moved to the unloading buffer belt for manual processing.

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

[0228] Step S816, the unloading belt is used to transport the batteries that have been filled with liquid.

[0229] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does 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. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0230] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A liquid injection system for injecting liquid into a battery, characterized in that: include: The rotary device is provided with a plurality of battery placement positions arranged along the circumferential direction and capable of rotational displacement, wherein the battery placement positions are used to place batteries, and each of the battery placement positions sequentially passes through a material inlet and outlet position, a liquid reserve position, at least one static buffer position and returns to the material inlet and outlet position through rotational displacement; A liquid injection device, each battery placement position is respectively equipped with the 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 disposed on the outer side of the rotating device in the circumferential direction, 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; A loading and unloading station is arranged on the circumferential outer side of the rotary device, and the loading and unloading station is configured to place batteries to be injected and batteries after injection; A refilling buffer station, configured to buffer batteries to be refilled; A transfer mechanism, configured to move the battery after injection from the battery placement position located at the material inlet and outlet position to the loading and unloading position, and to move the battery to be injected from the loading and unloading position to the battery placement position located at the material outlet position, or to move the battery to be replenished from the replenishment buffer position to the battery placement position located at the material inlet and outlet position; a first weighing device, the first weighing device being configured to weigh the battery after liquid injection; a second weighing device, the second weighing device being configured to weigh the battery to be injected with liquid; A control device, wherein the control device is configured to control the second weighing device to weigh the battery to be injected, and then control the transfer mechanism to move the battery to be injected located at the loading and unloading station to the battery placement position located at the inlet and outlet position, control the rotary device to rotate and shift the battery placement position, and control the liquid preparation mechanism to prepare liquid for the injection device equipped at the battery placement position shifted to the liquid preparation position, control the injection device after liquid preparation to inject liquid into the battery at the battery placement position before the battery placement position rotates back to the inlet and outlet position, control the transfer mechanism to move the injected battery that rotates back to the inlet and outlet position from the battery placement position to the loading and unloading station, and then control the first weighing device to weigh the injected battery, and after the battery to be injected is transferred to the injection buffer station after weighing, further control the transfer mechanism to move the battery to be injected at the injection buffer station to the battery placement position located at the inlet and outlet position and without the battery placed.

2. The liquid injection system according to claim 1, characterized in that: The injection system includes a feeding detection device, the control device controls the feeding detection device to detect batteries passing through a detection area of ​​the feeding detection device, the feeding detection device includes a second weighing device, and the second weighing device is configured to weigh batteries to be injected that pass through a weighing area of ​​the second weighing device. For the same battery, when the difference between the weight of the battery after 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 liquid injection system according to claim 2, characterized in that: The injection system includes the robot, a loading pull belt with a material picking position and a unloading pull belt with a material unloading position. The loading detection device is arranged on one side of the loading pull belt. The control device controls the robot to transfer the qualified batteries at the material picking position to the loading and unloading station, and transfer the batteries after injection at the loading and unloading station to the unloading position.

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

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

6. The liquid injection system according to any one of claims 3 to 5, characterized in that: The injection system includes a loading buffer pull belt, and the control device controls the robot to transfer unqualified batteries detected by the loading detection device to the loading buffer pull belt.

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

8. The liquid injection system according to any one of claims 3 to 7, characterized in that: The injection system includes a material unloading detection device, which includes the first weighing device and a second scanning device arranged on one side of the material unloading pull belt. The control device controls the second scanning device to scan the batteries passing through the scanning area of ​​the second scanning device.

9. The liquid injection system according to any one of claims 3 to 8, characterized in that: The liquid injection system includes a material unloading buffer pull belt, and the control device controls the robot to transfer unqualified batteries detected by the material unloading detection device to the material unloading buffer pull belt.

10. The liquid injection system according to claim 9, characterized in that: The injection system includes a material unloading pairing station, and the control device controls the robot to transfer unqualified battery packs detected by the material unloading detection device to the material unloading pairing station. The unqualified battery packs contain at least one unqualified battery. The control device controls the robot to transfer the batteries to be replenished at the material unloading pairing station to the replenishment buffer station, transfer the unqualified batteries other than those to be replenished to the material unloading buffer pull belt, and transfer the qualified batteries at the material unloading pairing station to the material unloading pull belt.

11. The liquid injection system according to any one of claims 3 to 10, characterized in that: The injection system includes a cleaning device disposed on one side of the unloading belt, and the control device can control the cleaning device to clean the batteries passing through the cleaning area of ​​the cleaning device.

12. The liquid injection system according to any one of claims 1 to 11, characterized in that: The liquid injection system includes a liquid injection fixture, which is configured to accommodate the battery to be injected or the battery to be replenished or the battery after injection. The transfer mechanism is used to move the liquid injection fixture accommodating the battery to be injected or the battery to be replenished from the loading and unloading station to the battery placement position, or to move the liquid injection fixture accommodating the battery after injection from the battery placement position to the loading and unloading station.

13. The liquid injection system according to any one of claims 1 to 12, characterized in that: The injection system comprises at least two rotating devices; and / or, The rotating device includes at least two static buffering positions, and each of the static buffering positions is arranged at intervals along the circumference of the rotating device.

14. The liquid injection system according to any one of claims 1 to 13, characterized in that: The liquid injection system includes a residual liquid receiving mechanism arranged on the outer side of the rotary device in the circumferential direction. Each battery placement position passes through the material inlet and outlet position, the liquid reserve position, at least one static buffer position, the residual liquid receiving position and returns to the material inlet and outlet position in sequence by rotation and displacement. The control device controls the residual liquid receiving mechanism to clean the residual electrolyte in the liquid filling cup of the liquid filling device at the battery placement position located at the residual liquid receiving position.

15. The liquid injection system according to any one of claims 1 to 14, characterized in that: The liquid injection system comprises at least two rotating devices, and the liquid replenishment buffer station is arranged between at least two of the rotating devices.

16. The liquid injection system according to any one of claims 3 to 11, characterized in that: The liquid injection system includes at least two rotating devices, the robot is located between the at least two rotating devices, and between the liquid replenishment buffer station and the unloading pull belt; the arrangement direction of the loading pull belt and the unloading pull belt is the same as the arrangement direction of at least two rotating devices, and the loading pull belt and the unloading pull belt are located on the same side of the at least two rotating devices.

17. A liquid injection method, applied to a liquid injection system for injecting liquid into a battery, the liquid injection system comprising a control device, a rotating device, a liquid injection device, a liquid preparation mechanism, a loading and unloading station, a liquid replenishment buffer station, a transfer mechanism, a first weighing device and a second weighing device, wherein: The rotary device is provided with a plurality of static station battery placement positions arranged along the circumferential direction and capable of rotational displacement, the battery placement positions are used to place batteries, and each of the battery placement positions passes through the material inlet and outlet position, the liquid reserve position, at least one static buffer position in sequence through rotational displacement and returns to the material inlet and outlet position, characterized in that the injection method comprises: The control device controls the second weighing device to weigh the battery to be injected with liquid; The control device controls the transfer mechanism to transfer the batteries to be filled at the loading and unloading station or the batteries to be filled at the filling buffer station to the battery placement position of the rotary device; The control device controls the rotating device to rotate the battery placement position, and in response to the battery to be injected or the battery to be replenished moving to the liquid preparation position, the control device controls the liquid preparation mechanism to prepare liquid for the injection device equipped at the battery placement position located at the liquid preparation position, and controls the injection device to evacuate the battery; In response to the completion of the 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 and outlet position; In response to the completion of the liquid injection, the control device controls the first weighing device to weigh the battery after the liquid injection that has been moved out of the battery placement position, and transfers the battery to be replenished after weighing to the liquid replenishment buffer station.

18. The liquid injection method according to claim 17, characterized in that: The injection system includes a loading pull belt, a loading buffer pull belt, and a loading detection device arranged on one side of the loading pull belt. Before the control device controls the transfer mechanism to transfer the battery to be injected at the loading and unloading station or the battery to be replenished at the replenishment buffer station to the battery placement position of the rotary device, it includes: The control device controls the feeding belt to transport the batteries to be injected with liquid; The control device controls the feeding detection device to detect batteries passing through the detection area of ​​the feeding detection device, and transfers the batteries that pass the detection to the loading and unloading station, and transfers the batteries that fail the detection to the feeding buffer pull belt.

19. The liquid injection method according to claim 18, characterized in that: The injection system includes a loading and pairing station, and the battery that passes the inspection is transferred to the loading and unloading station, and the battery that fails the inspection is transferred to the loading and buffering belt, including: The control device transfers the battery packs that have passed the inspection to the loading and unloading station, and transfers the battery packs that have failed the inspection to the loading and pairing station, wherein the unqualified battery packs include at least one unqualified battery; The control device transfers the batteries that fail the inspection at the loading pairing station to the loading buffer pull belt, and if the number of batteries that pass the inspection at the loading pairing station reaches a preset number, the control device transfers the preset number of batteries to the loading and unloading stations.

20. The liquid injection method according to claim 18 or 19, characterized in that: The control device controls the feeding detection device to detect batteries passing through a detection area of ​​the feeding detection device, including: The feeding 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, The feeding detection device includes a short-circuit test device, and the control device controls the short-circuit test device to perform a short-circuit test on batteries passing through a test area of ​​the short-circuit test device; and / or, The feeding detection device includes a first code scanning device, and the control device controls the first code scanning device to scan the batteries passing through the code scanning area of ​​the first code scanning device.

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