Battery impregnation apparatus, method, and battery production system

Abstract

The application relates to a battery infiltration device, a battery infiltration method and a battery production system, and belongs to the technical field of battery production. The battery infiltration device is used for improving the electrolyte infiltration effect of a hard-shell battery monomer and comprises a base body and a roller pressing piece. The roller pressing piece comprises a traction part and a roller body part. The traction part is arranged on the base body, the roller body part is arranged on the traction part, the traction part is configured to drive the roller body part to move, and the surface of the battery monomer is pressed by the roller body part. The battery infiltration device, the battery infiltration method and the battery production system provided by the application are used for breaking the liquid sealing phenomenon that is easily formed at the center position of a bare battery after liquid injection, improving the infiltration effect of liquid injection of the bare battery and improving the infiltration yield.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery wetting apparatus, method and battery manufacturing system. Background Technology

[0002] During the electrolyte injection process of a battery cell, the electrolyte usually wets the bare cell from the periphery to the center. This causes the periphery (closer to the casing) of the electrode to be wetted by the electrolyte first. As a result, the gap between the electrode and the separator, as well as the microporous structure inside the electrode, are filled with electrolyte. This makes it difficult for the gas in the central area of ​​the bare cell to escape due to the liquid seal at the periphery, resulting in poor wetting of the bare cell. Summary of the Invention

[0003] In view of the above problems, this application provides a battery wetting device, method and battery production system, which can break the liquid seal phenomenon that easily forms at the center of the bare cell after liquid injection, improve the wetting effect of the bare cell liquid injection and improve the wetting yield.

[0004] In a first aspect, embodiments of this application provide a battery wetting device for improving the electrolyte wetting effect of hard-shell battery cells. The battery wetting device includes a base and a rolling element, wherein the rolling element includes a traction part and a roller body part. The traction part is disposed on the base, and the roller body part is disposed on the traction part. The traction part is configured to drive the roller body part to move, thereby rolling the surface of the battery cell.

[0005] In the technical solution of this application embodiment, by setting a rolling pressing component including a traction part and a roller body part, the traction part is set on the base body. The traction part can drive the roller body part to roll the surface of the battery cell, thereby breaking the liquid seal phenomenon at the center of the bare cell through the rolling pressing of the roller body part, so that the electrolyte can wet the center of the bare cell, improving the wetting effect of the electrolyte and the wetting yield is higher.

[0006] In some embodiments, the traction unit includes a telescopic rod and a support frame, with the roller body rotatably connected to the support frame. The two ends of the telescopic rod are respectively connected to the support frame and the base. The telescopic rod and the support frame serve the functions of control and support, respectively, resulting in a simple and easily implemented structure.

[0007] In some embodiments, the telescopic rod is rotatably connected to the base, and / or the telescopic rod is rotatably connected to the support frame. This design improves the angle adjustment capability of the roller pressing component, enabling it to roll the surface of the battery cell in different directions, which is beneficial for improving the discharge rate of liquid-sealed gas in the bare cell.

[0008] In some embodiments, the telescopic rod includes a first ball head disposed at one end opposite to the support frame, and the base includes a first groove in which the first ball head is engaged. The telescopic rod is configured to rotate circumferentially about the first ball head as the rotation center. By setting the first ball head at the end of the telescopic rod opposite to the support frame, that is, by connecting and cooperating with the base through the structure of the ball head, the angle adjustment capability of the connection end between the telescopic rod and the base is further improved.

[0009] In some embodiments, the telescopic rod includes a second ball head disposed at one end near the support frame. The support frame includes a second slot, and the second ball head is engaged within the second slot. The telescopic rod is configured to rotate circumferentially about the second ball head as a rotation center. By setting the second ball head at one end of the telescopic rod near the support frame, that is, by connecting and cooperating with the support frame through the structure of the ball head, the angle adjustment capability of the connection end between the telescopic rod and the support frame is further improved.

[0010] In some embodiments, the roll forming member is configured to roll-form a square-shell battery cell, and the length of the roll body is configured to be less than one-third of the width of the large surface area of ​​the battery cell. This design allows the force applied by the roll forming member to be more concentrated at the center of the battery cell surface, enabling greater deformation of the battery cell surface corresponding to the center of the bare cell. This improves the efficiency of breaking the liquid seal phenomenon at the center of the bare cell and allows for better electrolyte wetting at the center of the bare cell.

[0011] In some embodiments, the diameter of the roller body is less than or equal to 3.5 cm. By limiting the diameter of the roller body to a small range, the distance traveled by the roller body in one rotation is smaller. That is, when the surface of the battery cell is rolled by the roller pressing member, more rotation cycles of the roller body are required, which reduces the control requirements of the traction unit and improves the reliability of the battery immersion device.

[0012] In some embodiments, the battery immersion apparatus further includes an electrolyte recovery component configured to communicate with the electrolyte inlet of the battery cell and to collect the electrolyte squeezed out during the rolling of the battery cell by the roller. By configuring the electrolyte recovery component to communicate with the electrolyte inlet of the battery cell, the electrolyte that may flow out of the inlet due to compression during the rolling process can be recovered, reducing electrolyte waste and improving the economic efficiency of the battery immersion apparatus.

[0013] In some embodiments, the electrolyte recovery assembly includes a suction nozzle, a pipe, and a storage tank connected in sequence, with the suction nozzle communicating with the injection port. This design utilizes the suction nozzle to enhance the connection tightness between the suction nozzle and the injection port of the battery cell, reducing the risk of the electrolyte recovery assembly detaching during battery immersion device operation and improving the connection reliability between the electrolyte recovery assembly and the injection port of the battery cell.

[0014] In some embodiments, there are multiple rolling elements, with at least two rolling elements used to accommodate a battery cell to form a rolling unit. The rolling elements in the rolling unit roll two opposite surfaces of the battery cell. By rolling the surfaces of the battery cell using the rolling unit, rolling can be performed simultaneously on at least two opposite surfaces of the battery cell, which can greatly improve the rolling efficiency of the battery cell. This, in turn, can more quickly and efficiently break the liquid seal phenomenon in the middle of the bare cell, resulting in higher production efficiency and reliability.

[0015] In some embodiments, at least one roller portion of the rolling unit is equipped with a gravity sensor. By providing a gravity sensor on the roller portion, the rolling unit can lift and roll the battery cell. During this process, the gravity sensor can detect changes in the weight of the battery cell and determine the loss of electrolyte in the battery cell during rolling. This allows for more precise replenishment of electrolyte to the battery cell during subsequent electrolyte replenishment.

[0016] Secondly, this application also provides a battery impregnation method, applied to the battery impregnation apparatus provided in any of the foregoing embodiments. The battery impregnation method includes the following steps: Step S1, providing a battery cell after electrolyte injection. Step S2, controlling a roller to perform at least one roller press on the surface of the battery cell. By controlling the roller to perform at least one roller press on the surface of the battery cell, the liquid seal at the center of the bare cell can be broken through the roller pressing, allowing the electrolyte to impregnate the center of the bare cell, thus improving the electrolyte impregnation effect and resulting in a higher impregnation yield.

[0017] In some embodiments, the battery impregnation method further includes: step S3, obtaining the amount of electrolyte lost by the battery cell after being rolled by the rolling element; step S4, replenishing the battery cell with electrolyte based on the amount lost. By setting a judgment step on electrolyte loss in step S3 and compensating for electrolyte loss in the battery cell in step S4, the electrode impregnation effect of the battery cell after rolling can be further improved.

[0018] In some embodiments, step S3, determining the amount of electrolyte lost by a battery cell after being rolled by the rollers, includes: Step S31, controlling at least two rollers to jointly clamp the battery cell and detach it from the substrate. Step S32, obtaining first weight data of the battery cell. Step S33, controlling two rollers to jointly squeeze the battery cell, and obtaining second weight data after squeezing is complete. Step S34, calculating the difference between the first weight data and the second weight data to obtain the weight of the lost electrolyte. This design is simple and easy to implement, and the method of determining electrolyte loss by the weight change of the battery cell is compatible with the structure of the battery immersion device, which is beneficial for saving battery cell production processes and improving battery cell production efficiency.

[0019] In some embodiments, after the step of providing the battery cell after electrolyte injection, the method further includes: step S5, connecting the electrolyte recovery assembly to the electrolyte injection port of the battery cell. By connecting the electrolyte recovery assembly to the electrolyte injection port of the battery cell, the electrolyte that may flow out of the injection port due to compression during the rolling process of the rolling element can be recovered using the electrolyte recovery assembly, which can reduce electrolyte waste and improve the economic efficiency of the battery immersion device.

[0020] In some embodiments, during the step of rolling the surface of the battery cell with a rolling element, at least one rolling process is performed in which the rolling element moves from the end of the battery cell away from the liquid injection port in a direction close to the liquid injection port. That is, during the step of rolling the surface of the battery cell with a rolling element, at least one rolling process is performed in a direction pointing towards the liquid injection port, so as to quickly discharge the gas trapped in the middle of the bare cell due to the liquid sealing phenomenon through the liquid injection port.

[0021] Thirdly, embodiments of this application also provide a battery production system, which includes a battery immersion device as provided in any of the foregoing embodiments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram showing the overall flow direction of the electrolyte after it flows into the injection port during the electrolyte injection process of a single battery cell.

[0024] Figure 2 This is a schematic diagram showing the liquid sealing phenomenon in a bare battery cell;

[0025] Figure 3 This is an exploded three-dimensional structural diagram of a battery cell in related technologies.

[0026] Figure 4 A three-dimensional schematic diagram of the cooperation structure between the battery wetting device and the battery cell provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram of the cooperation structure between the roller pressing component and the electrolyte recovery assembly and the battery cell in a battery immersion device provided in an embodiment of this application;

[0028] Figure 6 A schematic diagram of the cooperation structure between the roller pressing component and the electrolyte recovery assembly and the battery cell in a battery immersion device provided in another embodiment of this application;

[0029] Figure 7 A flowchart illustrating a battery wetting method provided in an embodiment of this application;

[0030] Figure 8 This is a flowchart of step S3 in a battery immersion method provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 200, battery cell; 201, casing; 202, electrode assembly; 203, end cap assembly; 2031, electrolyte inlet;

[0032] 100. Battery immersion device; 10. Substrate; 20. Roller pressing component; 21. Traction unit; 211. Telescopic rod; 2111. First ball head; 2112. Second ball head; 212. Support frame; 22. Roller body; 30. Electrolyte recovery assembly; 31. Nozzle; 32. Pipeline; 33. Storage tank. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the term "and / or" appears, "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0040] In the field of new energy, batteries, as power supply devices, serve as the primary power source for electrical devices such as electric vehicles, ships, or spacecraft, and their importance is self-evident. In this application, the battery may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. In some related technologies, the battery may also be referred to as a battery cell or a battery cell. In specific implementations, one or more batteries may form a battery module or battery pack to provide higher voltage and capacity to electrical devices. Optionally, the battery pack may include a housing for encapsulating one or more batteries. The housing can reduce the impact of liquids or other foreign matter on the charging or discharging of the battery.

[0041] In this application, the battery may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited in this respect. In addition, batteries are generally divided into two types according to their packaging method: cylindrical batteries and cuboid batteries, and the embodiments of this application are not limited in this respect either.

[0042] The development of battery technology must consider multiple design factors simultaneously. For example, to improve battery charge and discharge performance, various performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate must be considered. In addition, battery manufacturing efficiency and performance are also crucial for the widespread adoption, application, and long-term development of batteries.

[0043] A battery generally includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrolyte, acting as the electrolyte solution, conducts ions between the positive and negative electrodes, enabling the battery to function properly. For lithium batteries, the electrolyte may include lithium salts and organic solvents.

[0044] In the battery manufacturing process, the electrolyte injection process (i.e., the process of injecting electrolyte into the battery casing) is also a very important process, and the manufacturing performance of this electrolyte injection process will affect the final product performance of the battery.

[0045] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a schematic diagram showing the overall flow direction of the electrolyte after it flows into the injection port during the electrolyte injection process of a single battery cell. Figure 2 This is a schematic diagram showing the liquid sealing phenomenon in a bare battery cell.

[0046] In related technologies, during the electrolyte injection process, after the electrolyte is injected through the injection port, it first flows towards the periphery of the bare cell, wetting the periphery and filling the gaps between the electrodes and separator, as well as the microporous structure inside the electrodes. However, the gas originally present in the middle of the bare cell is difficult to expel because the periphery has already been wetted. This results in the middle of the bare cell being poorly wetted by the electrolyte due to a liquid-sealing phenomenon. During subsequent battery use, the gas remaining in the center of the bare cell continues to hinder the electrolyte from wetting the electrodes in the middle, thus blocking the ion pathway. This makes lithium plating more likely to occur in the center of the bare cell during cycling.

[0047] In view of this, embodiments of this application provide a battery wetting apparatus, method, and battery production system, applied to batteries with electrolyte inlets. The battery wetting apparatus, used to improve the electrolyte wetting effect of hard-shell battery cells, includes a substrate and a rolling element. The rolling element includes a traction section and a roller section, wherein the traction section is disposed on the substrate, and the roller section is disposed on the traction section. The traction section is configured to control the movement of the roller section, thereby rolling the surface of the battery cell. Through the technical solution of this application embodiment, the traction section can control the roller section to roll the surface of the battery cell, thereby breaking the liquid seal phenomenon at the center of the bare cell through the rolling of the roller section, allowing the electrolyte to wet the center of the bare cell, improving the electrolyte wetting effect and increasing the wetting yield.

[0048] The technical solutions described in the embodiments of this application are applicable to batteries in various electrical devices, such as electric vehicles, electric bicycles, power tools, ships, and spacecraft, including airplanes, rockets, space shuttles, and spacecraft. It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to batteries in all electrical devices.

[0049] Please refer to the following: Figures 1 to 3 , Figure 3 This is an exploded view of the three-dimensional structure of a single battery cell in related technologies.

[0050] The battery cell 200 includes a housing 201, an electrode assembly 202, and an end cap assembly 203. The housing 201 and the end cap assembly 203 form a casing or battery box. The housing 201 may be formed of a metal (e.g., aluminum). The shape of the housing 201 depends on the combination of one or more electrode assemblies 202.

[0051] The housing 201 has an opening, and the electrode assembly 202 is housed within the housing 201. An end cap assembly 203 covers the opening to further house the electrode assembly 202 within the housing 201. The housing 201 and end cap assembly 203 provide for the containment and protection of the electrode assembly 202 and other components. The housing 201 is filled with an electrolyte, i.e., an electrolyte solution.

[0052] In the battery cell 200 provided in this application embodiment, the electrode assembly 202 can be configured as one or more according to actual usage requirements, for example, in Figure 3 In the embodiment shown, an electrode assembly 202 is disposed within the battery cell 200.

[0053] See also Figure 3 As shown, the housing 201 can be an open structure at one end or an open structure at both ends. Therefore, the end cap assembly 203 can be disposed at one end of the housing 201, or it can include two parts respectively disposed at the two opening positions of the housing 201. The end cap is usually provided with a positive electrode terminal and a negative electrode terminal, and the electrode assembly 202 is provided with a tab, wherein the positive electrode terminal is electrically connected to the positive tab of the electrode assembly 202, and the negative electrode terminal is electrically connected to the negative tab of the electrode assembly 202.

[0054] In addition to the electrode terminals, the end cap assembly 203 may also be provided with a liquid injection port 2031, for example, in Figure 3 In the illustrated embodiment, an injection port 2031 is provided at the center of the end cap assembly 203. During the electrolyte injection process of the battery cell 200, an external injection tool can be positioned at the injection port 2031 to inject electrolyte into the battery cell 200.

[0055] It should be noted that, in the battery cell 200 provided in the embodiments of this application, in addition to electrode terminals and liquid injection port 2031, other battery components, such as pressure relief mechanism, may also be provided on the end cap assembly 203. The specific composition structure of the battery cell 200 is not limited in the embodiments of this application.

[0056] in addition, Figure 3 The battery cell 200 shown is illustrated using a prismatic battery as an example. The battery provided in this application can also be a cylindrical battery or a battery of other shapes. In a cylindrical battery, its components can be the same as described above. Figure 3 Similar to the battery cell 200 shown, the casing of this cylindrical battery can be a hollow cylindrical casing.

[0057] Please refer to the following: Figures 1 to 6 , Figure 4 A three-dimensional schematic diagram of the cooperation structure between the battery wetting device and the battery cell provided in an embodiment of this application; Figure 5 A schematic diagram of the cooperation structure between the roller pressing component and the electrolyte recovery assembly and the battery cell in a battery immersion device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the cooperation structure between the roller pressing component and the electrolyte recovery assembly and the battery cell in a battery immersion device provided in another embodiment of this application.

[0058] This application provides a battery wetting device 100, which is used to improve the electrolyte wetting effect of a hard-shell battery cell 200. The battery wetting device 100 includes a base 10 and a roller pressing member 20. The roller pressing member 20 includes a traction part 21 and a roller body 22. The traction part 21 is disposed on the base 10, and the roller body 22 is disposed on the traction part 21. The traction part 21 is configured to drive the roller body 22 to move, thereby rolling the surface of the battery cell 200.

[0059] The battery wetting device 100 serves to improve the liquid sealing phenomenon of the battery cell 200 after electrolyte injection, venting the gas in the center of the bare cell and allowing the electrolyte to wet the center of the bare cell. In these embodiments of this application, the battery wetting device 100 is mainly used to roll the hard-shell battery cell 200 to eliminate the liquid sealing phenomenon in the center of the battery cell 200 and improve the effect of electrolyte wetting of the electrode assembly 202.

[0060] Among them, the hard-shell battery cell 200 refers to the battery cell 200 whose shell 201 material has a large elastic modulus and whose shell 201 will not easily deform under the action of external force.

[0061] The substrate 10 serves as a support structure for the battery immersion device 100, supporting and bearing the roller pressing member 20 and the battery cell 200 after liquid injection. In these embodiments of this application, the substrate 10 may be, but is not limited to, a plate-like structure, a block-like structure, etc. Furthermore, the substrate 10 may be a structure fixed on the battery production line, or a structure whose position can be changed by moving or disassembling.

[0062] The roller pressing component 20 is the actual component in the battery immersion device 100 used to contact the battery cell 200. It alone or in conjunction with the substrate 10 discharges the gas remaining at the center of the battery cell 200 due to the liquid sealing phenomenon, so that the center part of the bare cell is well wetted with electrolyte.

[0063] The roller pressing component 20 includes a traction part 21 and a roller body part 22. The traction part 21 is a component in the roller pressing component 20 used to control the roller pressing direction or roller pressing intensity. The roller body part 22 is the component in the roller pressing component 20 that actually contacts the battery cell 200. It can be understood that the roller body part 22 can roll along its own axis. The traction part 21 drives the roller body part 22 to contact and squeeze the surface of the battery cell 200. At the same time, through the rolling action of the roller body part 22 itself, the gas remaining in the center of the bare cell due to the liquid sealing phenomenon is gradually squeezed out of the center of the bare cell and finally discharged from the battery cell 200 through the liquid injection port.

[0064] In this way, the liquid sealing phenomenon in the center of the bare cell can be eliminated, allowing the electrolyte to further wet the center of the bare cell, thereby improving the phenomenon that lithium plating easily occurs in the center of the bare cell during the cycle and enhancing the stability of the battery cell 200 during the cycle.

[0065] The roller body 22 is disposed on the traction unit 21. The traction unit 21 is configured to drive the roller body 22 to move. This means that the roller body 22 cooperates with the traction unit 21 so that the roller body 22 can be displaced under the drive of the traction unit 21, thereby using the roller body 22 to break the liquid seal phenomenon in the battery cell 200.

[0066] It should be noted that the traction unit 21 may or may not include a power source. In an embodiment where the traction unit 21 includes a power source, the traction unit 21 can operate under the drive of its own power source, thereby driving the roller unit 22 to roll the surface of the battery cell 200. In an embodiment where the traction unit 21 does not include a power source, the traction unit 21 can also be connected to an external power element, serving as a power transmission mechanism for the external power element, driving the roller unit 22 to roll the surface of the battery cell 200.

[0067] The roller body 22 is disposed on the traction part 21. In a possible implementation, the roller body 22 can be detachably connected to the traction part 21 by means of snap-fit ​​connection or connecting parts (screws, bolts, etc.) to facilitate subsequent maintenance and replacement of the roller body 22 or the traction part 21. Alternatively, in some embodiments, the roller body 22 and the traction part 21 can be connected by a fixed connection method such as welding or bonding to improve the structural consistency between the roller body 22 and the traction part 21 and improve the structural reliability of the roller pressing part 20.

[0068] The traction part 21 is disposed on the base 10. In a possible implementation, the base 10 is provided with a structure for mounting the traction part 21. During the production and assembly stage of the battery immersion device 100, the traction part 21 can be assembled with the base 10. Alternatively, in some embodiments, a portion of the structure of the traction part 21 can be formed with the base 10 by gluing, welding or even integral molding to achieve the connection between the traction part 21 and the base 10.

[0069] After the traction unit 21 is installed on the base 10, the position on the base 10 near the traction unit 21 is the placement position of the battery cell 200 (which needs to be determined according to the operating range of the control roller pressing part 20 of the traction unit 21). During the operation of the battery immersion device 100, the battery cell 200 that has been injected with liquid can first be placed on the base 10 near the traction unit 21, and then the traction unit 21 is controlled to work, driving the roller part 22 to roll the surface of the battery cell 200.

[0070] The roller pressing component 20 rolls the surface of the battery cell 200 to induce a certain elastic deformation in the casing of the battery cell 200, making the internal structure of the battery cell 200 more compact, thereby breaking the liquid seal phenomenon in the middle part of the bare cell.

[0071] In these embodiments of this application, the rolling element 20 needs to be adapted to the surface of the battery cell 200 to obtain a better rolling effect. For example, in an embodiment where the battery cell 200 is a prismatic battery, the roller portion 22 of the rolling element 20 can be cylindrical, thereby obtaining a good and uniform rolling effect when rolling the prismatic battery; in an embodiment where the battery cell 200 is a cylindrical battery, the roller portion 22 can be recessed along the center position of the axis towards the axis to form an annular groove that matches the outer surface of the cylindrical battery, thereby allowing the outer surface of the cylindrical battery to be inserted into the aforementioned groove when rolling the cylindrical battery with the rolling element 20, and rolling the outer surface of the cylindrical battery more uniformly.

[0072] In embodiments where the battery cell 200 is a prismatic battery, a roller pressing member 20 can be set to act on the large surface of the battery cell 200. The large surface of the battery cell 200 is squeezed to obtain greater deformation of the battery cell 200, which increases the probability of the roller pressing member 20 breaking the liquid seal phenomenon in the middle part of the bare cell. At the same time, it is also beneficial to set the roller pressing direction. By roller pressing the surface of the battery cell 200 through each roller pressing direction, the gas discharge effect can be further improved, and the bare cell can be better wetted.

[0073] In some embodiments of this application, a single roller 20 may be configured to roll the battery cell 200 in conjunction with the structure of the substrate 10, or at least two rollers 20 may be configured to roll the battery cell 200 in conjunction with each other.

[0074] For example, in some embodiments, the substrate 10 can be configured as a structure including a bottom wall and a side wall (not shown). After the battery cell 200 is filled with liquid, the battery cell 200 can be placed at the connection between the bottom wall and the side wall, so that one large surface of the battery cell 200 is in contact with the side wall. At this time, the roller pressing member 20 can be set at the other large surface of the battery cell 200, and a roller pressing operation can be performed on the other large surface of the battery cell 200.

[0075] In some embodiments, the number of rollers 20 can be multiple, and the multiple rollers 20 form a ring structure on the base 10. In this case, the battery cell 200 can be placed in the ring structure, and the multiple rollers 20 can be controlled to perform roller pressing operations on the battery cell 200 from different directions at the same time.

[0076] In some embodiments of this application, the base 10 may be provided with a slot, fastener or other structure to fix the battery cell 200 after it is placed in; in some embodiments, the base 10 may not be provided with a fixing structure for the battery cell 200, but may only be used to support the battery cell 200.

[0077] According to the battery wetting apparatus 100 provided in the embodiments of this application, by setting the roller pressing member 20 including a traction part 21 and a roller body part 22, the traction part 21 is disposed on the base 10, and the roller body part 22 can be controlled by the traction part 21 to roll the surface of the battery cell 200, thereby breaking the liquid seal phenomenon at the center position of the bare cell through the rolling pressing of the roller body part 22, so that the electrolyte can wet the center position of the bare cell, improving the wetting effect of the electrolyte and the wetting yield is higher.

[0078] In some embodiments, the traction part 21 includes a telescopic rod 211 and a support frame 212, the roller part 22 is rotatably connected to the support frame 212, and the two ends of the telescopic rod 211 are respectively connected to the support frame 212 and the base 10.

[0079] The telescopic rod 211 is the power component in the roller pressing component 20. By controlling the extension and retraction of the telescopic rod 211, the distance between the roller body 22 and the battery cell 200, the force applied to the battery cell 200 after contact with the battery cell 200, etc.

[0080] The function of the support frame 212 is to mount the roller body 22, so that the roller body 22 and the traction unit 21 can be well and reliably connected. The roller body 22 is rotatably connected to the support frame 212, meaning that at least a portion of the support frame 212 is rotatably connected to both ends of the roller body 22 in the circumferential direction, so that the roller body 22 is connected to the support frame 212 and can rotate relative to the support frame 212.

[0081] In some embodiments of this application, the telescopic rod 211 can be driven by a cylinder. In some embodiments, the telescopic rod 211 can also be a gear and rack structure driven by a motor or a lead screw telescopic structure.

[0082] The two ends of the telescopic rod 211 are connected to the support frame 212 and the base 10, respectively, so that the roller part 22 can be moved in the direction of approaching or moving away from the base 10 through the telescopic rod 211, thereby changing the contact state (contact or non-contact) between the roller part 22 and the battery cell 200, and the force applied by the roller part 22 to the battery cell 200.

[0083] In some embodiments, the telescopic rod 211 is rotatably connected to the base 10, and / or the telescopic rod 211 is rotatably connected to the support frame 212.

[0084] In other words, the telescopic rod 211 is rotatably connected to the base 10, or the telescopic rod 211 is rotatably connected to the support frame 212, or both ends of the telescopic rod 211 are rotatably connected to the base 10 and the support frame 212 respectively.

[0085] The rotatable connection between the telescopic rod 211 and the base 10 means that the angle between the telescopic rod 211 and the base 10 (the surface for mounting the telescopic rod 211) is adjustable, thereby changing the extension and retraction direction of the telescopic rod 211, and thus achieving the effect of adjusting the position of the roller body 22 acting on the battery cell 200 or adjusting the force of the roller body 22 acting on the battery cell 200.

[0086] The rotatable connection between the telescopic rod 211 and the support frame 212 means that the angle between the telescopic rod 211 and the support frame 212 is adjustable, which in turn can adjust the contact angle between the support frame 212 and the battery cell 200, so that the roller body 22 can better contact and roll the surface of the battery cell 200, reducing the risk of contact between the support frame 212 and the battery cell 200.

[0087] According to the battery immersion device 100 provided in the embodiments of this application, this design improves the angle adjustment capability of the roller pressing member 20, enabling the roller pressing member 20 to press the surface of the battery cell 200 in different directions, which is beneficial to improving the discharge rate of liquid-sealed gas in the bare cell.

[0088] In some embodiments, the telescopic rod 211 includes a first ball head 2111 disposed at one end opposite to the support frame 212, and the base 10 includes a first slot (not shown). The first ball head 2111 is engaged in the first slot, and the telescopic rod 211 is configured to rotate circumferentially about the first ball head 2111 as the rotation center.

[0089] The setting of the first ball head 2111 further enhances the angle adjustment capability between the telescopic rod 211 and the base 10, so that the telescopic rod 211 has a greater degree of rotational freedom relative to the base 10, thereby making it possible for the telescopic rod 211 to control the roller body 22 to roll the battery cell 200 in different directions.

[0090] In these embodiments of this application, the rotation of the first ball head 2111 in the first slot can adjust the direction of the telescopic rod 211 toward the battery cell 200, thereby controlling the roller body 22 to roll the large surface of the battery cell 200 at an angle, and the tilt angle of the rolling direction can be adjusted. In this way, by repeatedly rolling the surface of the battery cell 200 in different directions, the probability of breaking the liquid seal phenomenon in the center of the bare cell can be further increased, and the reliability of the battery immersion device 100 can be further improved.

[0091] It should be noted that in these embodiments of this application, a combination of a universal joint and a limiting device can be formed between the first ball head 2111 and the first slot. Specifically, by providing an adjustable damper or brake on the universal joint (first ball head 2111), or by providing a mechanical limiting structure outside the universal joint, the first ball head 2111 can self-position after angle adjustment, thus preventing significant angle changes and improving stability when the roller body 22 is driven by the telescopic rod 211 for rolling. Of course, in some embodiments, there may be no positioning or braking component between the first ball head 2111 and the first slot, and by providing a retractable bracket connected to the telescopic rod 211, the stability of the telescopic rod 211 after changing its orientation or angle with the base 10 can be improved.

[0092] In some embodiments, the telescopic rod 211 includes a second ball head 2112 disposed at one end near the support frame 212, the support frame 212 includes a second slot (not shown), the second ball head 2112 is engaged in the second slot, and the telescopic rod 211 is configured to be able to rotate circumferentially about the second ball head 2112 as the rotation center.

[0093] The second ball head 2112 enhances the angle adjustment capability between the telescopic rod 211 and the support frame 212, allowing the support frame 212 to be adapted to the telescopic rod 211. When the angle between the telescopic rod 211 and the base 10 changes, the orientation of the support frame 212 (roller part 22) on the surface of the battery cell 200 is adjusted accordingly, thereby smoother changing of the rolling direction of the roller pressing member 20.

[0094] In some embodiments of this application, the two ends of the telescopic rod 211 are respectively configured as a first ball head 2111 and a second ball head 2112. The telescopic rod 211 is connected to the base 10 and the support frame 212 through the first ball head 2111 and the second ball head 2112, thereby greatly improving the angle adjustment capability of the roller pressing component 20, enabling the roller pressing component 20 to roll the battery cell 200 in a more suitable direction and with a more suitable force, thereby achieving the effect of breaking the liquid seal phenomenon in the center of the bare cell.

[0095] In some embodiments, the roll forming member 20 is configured to roll forming a square-shell battery cell 200, and the length dimension of the roll body portion 22 is configured to be less than one-third of the large surface width of the battery cell 200.

[0096] The length dimension of the roller portion 22 refers to the axial dimension of the roller portion 22. In these embodiments of this application, by setting the length dimension of the roller portion 22 to be less than one-third of the width of the large surface of the battery cell 200, the force applied by the roller portion 22 to the battery cell 200 can be more concentrated in the central part of the large surface of the battery cell 200, making the battery cell 200 more prone to elastic deformation, extruding the gas remaining in the central part of the bare cell through roller pressure, thereby improving the electrolyte wetting effect of the bare cell.

[0097] For example, in these embodiments of this application, the length of the roller portion 22 can be configured to be in a ratio of 1:4, 1:5, or 1:6 to the width of the battery cell 200. This design improves the efficiency of breaking the liquid seal at the center of the bare cell, allowing for better electrolyte wetting at the center of the bare cell.

[0098] In some embodiments, the diameter of the roller body 22 is less than or equal to 3.5 cm.

[0099] In these embodiments of the present application, by limiting the diameter of the roller body 22 to a small range, the distance traveled by the roller body 22 in one roll is smaller. That is, when the surface of the battery cell 200 is rolled by the roller pressing member 20, more rotation cycles of the roller body 22 are required, which reduces the control requirements of the traction member 21 and improves the reliability of the battery immersion device.

[0100] In other words, in embodiments where the diameter of the roller portion 22 is designed to be larger, such as when the roller portion 22 can roll from one side of the large surface of the battery cell 200 to the other side by rolling a quarter turn, the traction unit 21 needs to control the rolling distance of the roller portion 22 more precisely, which may result in the risk that the roller portion 22 will detach from the battery cell 200 or that the roller pressure will be applied too much to the periphery of the battery cell 200.

[0101] For example, the diameter of the roller body 22 may be set to 3.2cm, 2.8cm, 2.5cm or 2.0cm.

[0102] In some embodiments, the battery immersion device 100 further includes an electrolyte recovery assembly 30, which is configured to communicate with the injection port 2031 of the battery cell 200 and to collect the electrolyte that is pressed out when the roller press 20 presses the battery cell 200.

[0103] The electrolyte recovery assembly 30 is connected to the electrolyte inlet 2031 of the battery cell 200 to collect the electrolyte that is pressed out when the battery cell 200 is rolled by the roller 20.

[0104] It is understood that the electrolyte recovery assembly 30 is configured to be connected to the electrolyte inlet 2031 of the battery cell 200, which means that the electrolyte recovery assembly 30 is provided with at least a pipeline structure and a storage structure. The pipeline structure of the electrolyte recovery assembly 30 is connected to the electrolyte inlet 2031 of the battery cell 200 so that the electrolyte in the battery cell 200 can flow through the pipeline structure to the storage structure for storage after being squeezed out.

[0105] In some embodiments, the electrolyte recovery assembly 30 may have one storage structure and multiple pipe structures. The multiple pipe structures are respectively used to connect to the liquid injection port 2031 of different battery cells 200 and respectively introduce the electrolyte squeezed out of the different battery cells 200 into the storage structure. In some embodiments, the electrolyte recovery assembly 30 may also have one storage structure and one pipe structure. In this case, the electrolyte recovery assembly 30 may have multiple components. One electrolyte recovery assembly 30 is used to correspond to one battery cell 200 to store the electrolyte squeezed out of the battery cell 200.

[0106] In these embodiments of the present application, the storage structure of the electrolyte recovery assembly 30 may be, but is not limited to, bag-shaped or cylindrical.

[0107] According to the battery immersion device 100 provided in the embodiments of this application, by setting an electrolyte recovery component 30 connected to the liquid injection port 2031 of the battery cell 200, the electrolyte recovery component 30 can be used to recover the electrolyte that may flow out of the liquid injection port 2031 due to compression during the rolling process of the roller 20, which can reduce the waste of electrolyte and improve the economic efficiency of the battery immersion device.

[0108] In some embodiments, the electrolyte recovery assembly 30 includes a suction nozzle 31, a pipe 32, and a storage tank 33 connected in sequence, with the suction nozzle 31 communicating with the injection port 2031.

[0109] The nozzle 31 can improve the connection between the electrolyte recovery assembly 30 and the liquid injection port 2031 of the battery cell 200, and enable the electrolyte recovery assembly 30 to be quickly connected to different battery cells 200 by inserting and removing the nozzle 31 on the production line.

[0110] In these embodiments of this application, the suction nozzle 31 can be made of rubber materials such as EPDM rubber, fluororubber, or perfluoroether rubber, or silicone material, to achieve good elasticity and toughness while possessing good chemical stability. In this way, the end of the suction nozzle 31 facing away from the liquid storage tank 33 can be designed with a bayonet structure, allowing it to connect to the liquid injection port 2031 of the battery cell 200 via a plug-in / plug-out method.

[0111] In some embodiments, the suction nozzle 31 may be made of materials such as metal or ceramic to obtain a certain structural strength. In this case, a threaded structure may be provided on the outer surface of the suction nozzle 31, thereby realizing the connection between the electrolyte recovery assembly 30 and the battery cell 200 through the threaded connection between the suction nozzle 31 and the liquid injection port 2031.

[0112] According to the battery immersion device 100 provided in the embodiments of this application, the suction nozzle 31 can be used to improve the connection tightness between the nozzle and the liquid injection port 2031 of the battery cell 200, reduce the risk of the electrolyte recovery component 30 falling off during the operation of the battery immersion device 100, and improve the connection reliability between the electrolyte recovery component 30 and the liquid injection port 2031 of the battery cell 200.

[0113] In some embodiments, there are multiple rollers 20, and at least two rollers 20 are used to accommodate a battery cell 200 to form a roller unit, wherein the rollers 20 in the roller unit roll two opposite surfaces of the battery cell 200.

[0114] The number of rollers 20 is multiple, meaning that in the battery immersion apparatus 100, a single base 10 can support multiple rollers 20, wherein the multiple rollers 20 can be paired so that at least two rollers 20 are used to accommodate battery cells 200 to form a roller unit.

[0115] Exemplarily, in some embodiments, a plurality of rollers 20 are provided on the substrate 10, wherein the plurality of rollers 20 are paired in pairs to form a roller unit. In a single roller unit, the extension and retraction directions of the telescopic rods 211 in the two rollers 20 are opposite to each other, so as to jointly roll the battery cell 200 placed between the two rollers 20.

[0116] In this way, at least two rolling elements 20 on the substrate 10 jointly roll a single battery cell 200, that is, the battery cell 200 is rolled by a rolling unit. Among them, the rolling elements 20 in the rolling unit roll two opposite surfaces of the battery cell 200. In this way, the rolling effect of the battery cell 200 can be further improved through the joint action of each rolling element 20.

[0117] For example, in an embodiment where the battery cell 200 is a prismatic battery, at least two rollers 20 can be provided to roll the battery cell 200 from its two large surfaces respectively. One roller 20 acts on one large surface of the battery cell 200, while the other roller 20 acts on the other large surface of the battery cell 200 at the same time. This allows the two opposite sides of the bare cell to be squeezed simultaneously, thereby further improving the squeezing effect on the center of the bare cell and making it more conducive to breaking the liquid seal effect in the center of the bare cell.

[0118] It should be noted that in these embodiments of this application, it is necessary to control the two roller pressing members 20 used to press the opposite sides of the battery cell 200 in the roller pressing unit. The movement trajectory of the two roller pressing members 20 needs to be controlled to be mirror symmetrical so that the two roller pressing members 20 always form a joint squeezing effect on the two opposite sides of the battery cell 200 during operation.

[0119] In some embodiments, at least one roller body 22 in the rolling unit is provided with a gravity sensor. This means that in these embodiments of the application, during the rolling process of the battery cell 200, the various rollers 20 in the rolling unit work together to lift the battery cell 200 away from the support of the base 10. At this time, the weight of the battery cell 200 can be sensed by the gravity sensor provided on the roller body 22.

[0120] In this way, during the rolling process of the battery cell 200, the weight data of the battery cell 200 can be recorded once after the rolling unit lifts the battery cell 200, and the weight data of the battery cell 200 can be recorded again after the rolling process is completed. By comparing the difference between the weight data of the battery cell 200 before and after the rolling process, the weight data of electrolyte lost by the battery cell 200 during the rolling process can be known. This allows for more accurate replenishment of electrolyte in the subsequent electrolyte replenishment process.

[0121] Please refer to the following: Figures 1 to 8 , Figure 7 A flowchart illustrating a battery wetting method provided in an embodiment of this application; Figure 8 This is a flowchart of step S3 in a battery immersion method provided in an embodiment of this application.

[0122] This application also provides a battery wetting method, which includes the following steps:

[0123] Step S1: Provide the battery cell 200 after electrolyte injection. This step can be the electrolyte injection step in the production process of the battery cell 200. Electrolyte can be injected into the battery cell 200 through an injection needle or injection tube. After the electrolyte injection of the battery cell 200 is completed, it is not necessary to seal the injection port 2031.

[0124] Of course, the liquid injection process is not a limitation of this application. In some embodiments, the battery cell 200 that has undergone liquid injection through other processes can also be obtained directly.

[0125] Step S2: Control the roller pressing component 20 to roll the surface of the battery cell 200 at least once.

[0126] This step aims to roll the surface of the battery cell 200 with the roller 20, thereby applying force to the center of the bare cell through the outer surface of the battery cell 200, so as to break the liquid seal phenomenon at the center of the bare cell.

[0127] In these embodiments of this application, the process of rolling the surface of the battery cell 200 at least once by the rolling element 20 refers to the design of the number of rolling cycles based on factors such as the type of battery cell and the size ratio between the rolling element 20 and the battery cell 200, so as to break the liquid seal phenomenon at the center of the bare cell.

[0128] For example, in embodiments where the size of the battery cell 200 is large or the elastic modulus of the casing 201 is small, the outer coating of the battery cell 200 is relatively soft. In this case, the liquid seal at the center of the bare cell can be broken by a few rolls. In this case, the number of rolls can be set to one, two or three.

[0129] In embodiments where the elastic modulus of the battery cell 200 is large, the number of times the rolling element 20 rolls the battery cell 200 can be appropriately increased, and the rolling effect of the battery cell 200 can be improved by using multiple rolling elements 20 to roll the battery cell 200 simultaneously.

[0130] According to the battery impregnation method provided in the embodiments of this application, by controlling the roller pressing member 20 to perform at least one roller pressing on the surface of the battery cell 200, the liquid seal phenomenon at the center position of the bare cell can be broken by the roller pressing of the roller body 22, so that the electrolyte can impregnate the center position of the bare cell, thereby improving the impregnation effect of the electrolyte and achieving a higher impregnation yield.

[0131] In some embodiments, the battery immersion method further includes: step S3, obtaining the amount of electrolyte lost by the battery cell 200 after being rolled by the rolling element 20.

[0132] This step aims to obtain the amount of electrolyte lost by the battery cell 200 due to the squeezing action after being subjected to the rolling action of the roller 20, so as to facilitate subsequent electrolyte replenishment of the battery cell 200. One possible implementation is to collect the electrolyte flowing out of the injection port 2031 from each battery cell 200 during rolling, and to measure the volume or weight of this portion of electrolyte to obtain the amount of electrolyte lost by that battery cell 200; alternatively, the battery cell 200 can be weighed, and the weight difference between the battery cell 200 before and after rolling can be used to determine the weight loss of electrolyte.

[0133] For example, in these embodiments of this application, the weight difference of the battery cell 200 before and after being rolled by the rolling member 20 can be obtained by setting a gravity sensor on the part of the substrate 10 used to receive each battery cell 200, thereby determining the amount of electrolyte lost.

[0134] In some embodiments, the volume difference of electrolyte in the battery cell 200 before and after being rolled by the rolling element 20 can be determined by setting a liquid level sensor in the battery cell 200, thereby determining the amount of electrolyte lost; or the amount of electrolyte lost can be directly obtained by measuring the volume of the collected electrolyte.

[0135] Step S4: Replenish the battery cell 200 with electrolyte according to the amount of electrolyte lost.

[0136] In this step, the lost electrolyte is replenished into the battery cell 200 according to the amount of electrolyte loss obtained in step S3, so that the electrode assembly 202 of the battery cell 200 can be more fully wetted by the electrolyte, thereby improving the reliability of the battery cell 200 in subsequent cycle use.

[0137] In some embodiments, step S3, the step of obtaining the amount of electrolyte lost by the battery cell after being rolled by the rolling element 20, includes:

[0138] Step S31: Control at least two rollers 20 to jointly clamp the battery cell 200 and detach the battery cell 200 from the substrate.

[0139] In this step, the battery cell 200 is rolled by a rolling unit, which may include a plurality of rolling elements 20. At least two of the rolling elements 20 together clamp the battery cell 200 so that the battery cell 200 is detached from the substrate 10.

[0140] Step S32: Obtain the first weight data of battery cell 200.

[0141] In these embodiments of the present application, the gravity sensor needs to be installed on the roller pressing member 20. By the joint action of at least two roller pressing members 20 in the roller pressing unit, the battery cell 200 is clamped and the battery cell 200 is separated from the base 10, which can reduce the weight influence between adjacent battery cells 200.

[0142] In other words, in embodiments where gravity sensors are mounted on the base 10, the support positions of adjacent battery cells 200 on the base 10 may affect their respective gravity sensors after the battery cells 200 are placed. In these embodiments of this application, by mounting the gravity sensors on the roller 20 and acquiring weight data after the battery cells 200 are removed from the base 10 in step S31, the aforementioned impact on weight data acquisition can be reduced, making the weight data acquired for the battery cells 200 more accurate and reliable.

[0143] It is known that the first weight data is the weight data of the battery cell 200 after the liquid filling is completed.

[0144] Step S33: Control the two rollers 20 to jointly extrude the battery cell 200, and obtain the second weight data of the battery cell 200 when the extrusion is completed.

[0145] This step aims to obtain the weight data of the battery cell 200 after the roller pressing component 20 completes the rolling operation of the battery cell 200. At this time, if electrolyte flows out during the rolling operation of the battery cell 200 by the roller pressing component 20, the weight data of the battery cell 200 will change accordingly.

[0146] Step S34: Calculate the difference between the first weight data and the second weight data to obtain the weight of the lost electrolyte.

[0147] This step calculates the difference between the first weight data and the second weight data to obtain the weight of the lost electrolyte. Then, when replenishing the electrolyte, an amount of electrolyte not less than the difference between the first weight data and the second weight data can be added to the battery cell 200 through the injection port 2031, so that the electrode assembly 202 can work in a full electrolyte environment, thereby improving the reliability of the battery cell 200.

[0148] It is understandable that after the liquid replenishment process is completed, the liquid injection port 2031 can be sealed by a sealing element to keep the internal environment of the battery cell 200 in a sealed state.

[0149] In some embodiments, after the step of providing the battery cell 200 after electrolyte injection, the method further includes: step S5, connecting the electrolyte recovery assembly 30 to the electrolyte injection port 2031 of the battery cell 200.

[0150] The electrolyte recovery assembly 30 is connected to the electrolyte inlet 2031 of the battery cell 200 to collect the electrolyte that is pressed out when the battery cell 200 is rolled by the roller 20.

[0151] In these embodiments of the present application, the electrolyte recovery assembly 30 may have one storage structure and multiple pipeline structures. The multiple pipeline structures are respectively used to connect to the injection port 2031 of different battery cells 200 and respectively introduce the electrolyte squeezed out of the different battery cells 200 into the storage structure. In some embodiments, the electrolyte recovery assembly 30 may also have one storage structure and one pipeline structure. In this case, the electrolyte recovery assembly 30 may be multiple. One electrolyte recovery assembly 30 is used to correspond to one battery cell 200 to store the electrolyte squeezed out of the battery cell 200.

[0152] According to the battery immersion device 100 provided in the embodiments of this application, by setting an electrolyte recovery component 30 connected to the liquid injection port 2031 of the battery cell 200, the electrolyte recovery component 30 can be used to recover the electrolyte that may flow out of the liquid injection port 2031 due to compression during the rolling process of the roller 20, which can reduce the waste of electrolyte and improve the economic efficiency of the battery immersion device.

[0153] In some embodiments, in the step of rolling the surface of the battery cell 200 by the rolling member 20, there is at least one rolling process in which the rolling member 20 moves from the end of the battery cell 200 away from the liquid injection port 2031 in a direction close to the liquid injection port 2031.

[0154] In these embodiments of the present application, during the process of rolling the surface of the battery cell 200 by the rolling member 20, at least one rolling is performed in the direction pointing to the liquid injection port 2031, so as to quickly discharge the gas trapped in the middle of the bare cell due to the liquid sealing phenomenon through the liquid injection port 2031 from the battery cell 200.

[0155] For example, in an embodiment where the housing 201 of the battery cell 200 is open at one end, the end cap assembly 203 is disposed at the open end of the housing 201 to cooperate with the housing 201 to form a receiving space for accommodating the electrode assembly 202, and the liquid injection port 2031 is disposed on the end cap assembly 203.

[0156] At this time, in the step of rolling the surface of the battery cell 200 by the rolling element 20, there is at least one rolling process that needs to be carried out along the bottom wall of the housing 201 toward the end cap assembly 203, so as to quickly discharge the gas trapped in the middle of the bare cell due to the liquid sealing phenomenon through the liquid injection port 2031 to the battery cell 200.

[0157] This application also provides a battery production system, which includes a battery immersion device 100 as provided in any of the foregoing embodiments.

[0158] Based on some embodiments of this application, please refer to the following: Figures 1 to 8 This application provides a battery wetting device 100, which includes a base 10, a roller pressing member 20, and an electrolyte recovery assembly 30. The roller pressing member 20 includes a traction part 21 and a roller body 22. The traction part 21 is disposed on the base 10, and the roller body 22 is disposed on the traction part 21. The traction part 21 is configured to control the movement of the roller body 22, thereby rolling the surface of the battery cell 200.

[0159] The substrate 10 serves as a support structure for the battery immersion device 100, supporting and bearing the roller pressing member 20 and the battery cell 200 after liquid injection. In these embodiments of this application, the substrate 10 may be, but is not limited to, a plate-like structure, a block-like structure, etc. Furthermore, the substrate 10 may be a structure fixed on the battery production line, or a structure whose position can be changed by moving or disassembling.

[0160] The roller pressing component 20 is the actual component in the battery immersion device 100 used to contact the battery cell 200. It alone or in conjunction with the substrate 10 discharges the gas remaining at the center of the battery cell 200 due to the liquid sealing phenomenon, so that the center part of the bare cell is well wetted with electrolyte.

[0161] The roller pressing component 20 includes a traction part 21 and a roller body part 22. The traction part 21 is a component in the roller pressing component 20 used to control the roller pressing direction and roller pressing intensity. The roller body part 22 is the component in the roller pressing component 20 that actually contacts the battery cell 200. It can be understood that the roller body part 22 can roll along its own axis. The traction part 21 controls the roller body part 22 to contact and squeeze the surface of the battery cell 200. At the same time, through the rolling action of the roller body part 22 itself, the gas remaining in the center of the bare cell due to the liquid sealing phenomenon is gradually squeezed out of the center of the bare cell and finally discharged from the battery cell 200 through the liquid injection port.

[0162] In this way, the liquid sealing phenomenon in the center of the bare cell can be eliminated, allowing the electrolyte to further wet the center of the bare cell, thereby improving the phenomenon that lithium plating easily occurs in the center of the bare cell during the cycle and enhancing the stability of the battery cell 200 during the cycle.

[0163] When the roller press 20 presses the battery cell 200, there is a possibility that the electrolyte may be lost through the injection port 2031 during the rolling process. Based on this, the electrolyte recovery component 30 is configured to communicate with the injection port 2031 of the battery cell 200 and is used to collect the pressed electrolyte when the roller press 20 presses the battery cell 200.

[0164] In some embodiments, the electrolyte recovery assembly 30 includes a suction nozzle 31, a pipe 32, and a storage tank 33 connected in sequence, with the suction nozzle 31 communicating with the injection port 2031.

[0165] The nozzle 31 can improve the connection between the electrolyte recovery assembly 30 and the liquid injection port 2031 of the battery cell 200, and enable the electrolyte recovery assembly 30 to be quickly connected to different battery cells 200 by inserting and removing the nozzle 31 on the production line.

[0166] In these embodiments of this application, the rolling direction, number of rolling cycles, rolling pressure, and structural shape of the roller body 22 of the roller pressing component 20 can be selected according to the size of the roller pressing component 20, the size of the battery cell 200 to be rolled, and the material of the battery cell 200 to be rolled, so as to break the liquid seal phenomenon in the center of the bare cell.

[0167] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0168] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery wetting device for improving the electrolyte wetting effect of hard-shell battery cells, characterized in that, include: Matrix; A rolling element includes a traction part and a roller body part. The traction part is disposed on the base, and the roller body part is disposed on the traction part. The length dimension of the roller body part is configured to be smaller than the large surface width of the battery cell. The traction part is configured to drive the roller body part to move, thereby rolling the surface of the battery cell. The number of rollers is multiple, and at least two rollers are used to accommodate the battery cell to form a roller unit. The rollers in the roller unit roll two opposite surfaces of the battery cell. During the rolling process of the battery cell, each roller in the roller unit works together to lift the battery cell so as to detach it from the support of the substrate. In the roller pressing unit, at least one of the roller body parts is provided with a gravity sensor; The battery immersion device further includes an electrolyte recovery component, which is configured to communicate with the injection port of the battery cell and is used to collect the electrolyte that is pressed out when the battery cell is rolled by the roller.

2. The battery immersion apparatus according to claim 1, characterized in that, The traction unit includes a telescopic rod and a support frame. The roller body is rotatably connected to the support frame, and the two ends of the telescopic rod are respectively connected to the support frame and the base.

3. The battery immersion apparatus according to claim 2, characterized in that, The telescopic rod is rotatably connected to the base, and / or the telescopic rod is rotatably connected to the support frame.

4. The battery immersion apparatus according to claim 3, characterized in that, The telescopic rod includes a first ball head disposed at one end away from the support frame, the base includes a first slot, the first ball head is engaged in the first slot, and the telescopic rod is configured to rotate circumferentially about the first ball head as the rotation center.

5. The battery immersion apparatus according to claim 3, characterized in that, The telescopic rod includes a second ball head disposed at one end near the support frame. The support frame includes a second slot, in which the second ball head is engaged. The telescopic rod is configured to rotate circumferentially about the second ball head as the center of rotation.

6. The battery immersion apparatus according to claim 1, characterized in that, The roller is configured to roll-press the battery cell into a square shell, and the length of the roller body is configured to be less than one-third of the width of the large surface of the battery cell.

7. The battery immersion apparatus according to claim 1, characterized in that, The diameter of the roller body is less than or equal to 3.5 cm.

8. The battery immersion apparatus according to claim 1, characterized in that, The electrolyte recovery assembly includes a suction nozzle, a pipe, and a storage tank connected in sequence, with the suction nozzle communicating with the injection port.

9. A battery wetting method, applied to the battery wetting apparatus as described in any one of claims 1 to 8, characterized in that, The method includes the following steps: Provide the battery cell after liquid injection; The rolling element is controlled to roll the surface of the battery cell at least once.

10. The battery wetting method according to claim 9, characterized in that, The method further includes: The amount of electrolyte lost by the battery cell after it has passed through the rolling mill is obtained. The battery cells are replenished with electrolyte based on the amount of electrolyte lost.

11. The battery wetting method according to claim 10, characterized in that, The step of obtaining the amount of electrolyte lost by the battery cell after being rolled by the rolling element includes: Control at least two of the rollers to jointly clamp the battery cell and detach the battery cell from the substrate; Obtain the first weight data of the battery cell; The two rollers are controlled to jointly extrude the battery cell, and the second weight data of the battery cell is obtained when the extrusion is completed. Calculate the difference between the first weight data and the second weight data to obtain the weight of the lost electrolyte.

12. The battery wetting method according to claim 9, characterized in that, The step of providing the battery cell after injection also includes: Connect the electrolyte recovery assembly to the electrolyte inlet of the battery cell.

13. The battery wetting method according to claim 9, characterized in that, In the step of the roller pressing member rolling the surface of the battery cell, there is at least one rolling process in which the roller pressing member moves from the end of the battery cell away from the liquid injection port along the direction close to the liquid injection port.

14. A battery production system, characterized in that, Includes the battery immersion device as described in any one of claims 1 to 8.

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