Battery infiltration device and method and battery production system

Abstract

The invention relates to a battery infiltration device and 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 single battery with a hard shell and comprises a base body and a rolling part, the rolling part 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, and the traction part is configured to drive the roller body part to move so as to roll the surface of the single battery. According to the battery infiltration device and method and the battery production system provided by the invention, the liquid seal phenomenon easily formed at the central position of the naked battery cell after the liquid injection of the single battery is broken, the infiltration effect of the liquid injection of the naked battery cell is improved, and the infiltration yield is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and particularly relates to a battery infiltration device, method and battery production system. Background Art

[0002] During the liquid injection process of a battery cell, since the electrolyte usually infiltrates from the periphery of the bare battery cell towards the middle part, the periphery (near the housing) of the electrode sheet is first infiltrated by the electrolyte, causing the gaps between the electrode sheet and the separator and the microporous structure inside the electrode sheet to be filled with the electrolyte. As a result, the gas in the central area of the bare battery cell is difficult to discharge due to the liquid sealing phenomenon at the periphery, resulting in poor infiltration of the bare battery cell. Summary of the Invention

[0003] In view of the above problems, the present application provides a battery infiltration device, method and battery production system, which can break the liquid sealing phenomenon that is likely to form at the central position of the bare battery cell after liquid injection, improve the infiltration effect of liquid injection of the bare battery cell, and improve the infiltration yield.

[0004] In a first aspect, an embodiment of the present application provides a battery infiltration device for improving the electrolyte infiltration effect of a battery cell with a hard shell. The battery infiltration device includes a base body and a rolling member. The rolling member includes a traction part and a roller body part. The traction part is arranged on the base body, and the roller body part is arranged on the traction part. The traction part is configured to drive the roller body part to move, and then roll the surface of the battery cell.

[0005] In the technical solution of the embodiment of the present application, by setting that the rolling member includes a traction part and a roller body part, and the traction part is arranged on the base body, the traction part can drive the roller body part to roll the surface of the battery cell, and then the liquid sealing phenomenon at the central position of the bare battery cell can be destroyed by the rolling of the roller body part, so that the electrolyte can infiltrate the central position of the bare battery cell, improving the infiltration effect of the electrolyte and having a higher infiltration yield.

[0006] In some embodiments, the traction part includes a telescopic rod and a support frame. The roller body part is rotatably connected to the support frame, and both ends of the telescopic rod are respectively connected to the support frame and the base body. The telescopic rod and the support frame are respectively used for control and support, and the structure is simple and easy to implement.

[0007] In some embodiments, the telescopic rod is rotatably connected to the base body, and / or the telescopic rod is rotatably connected to the support frame. Such a design method improves the angle adjustment ability of the rolling member, enables the rolling member to roll the surface of the battery cell in different directions, and is beneficial to improving the discharge rate of the gas in the liquid seal in the bare battery cell.

[0008] In some embodiments, the telescopic rod includes a first ball head disposed at one end facing away from the support frame. The base body includes a first card slot, and the first ball head is clamped in the first card slot. The telescopic rod is configured to be able to rotate circumferentially with the first ball head as the rotation center. By providing the telescopic rod with a first ball head at one end facing away from the support frame, that is, by connecting and cooperating with the base body through the structure of the ball head, the angle adjustment ability of the connection end of the telescopic rod and the base body is further improved.

[0009] In some embodiments, the telescopic rod includes a second ball head disposed at one end close to the support frame. The support frame includes a second card slot, and the second ball head is clamped in the second card slot. The telescopic rod is configured to be able to rotate circumferentially with the second ball head as the rotation center. By providing the telescopic rod with a second ball head at one end close to the support frame, that is, by connecting and cooperating with the support frame through the structure of the ball head, the angle adjustment ability of the connection end of the telescopic rod and the support frame is further improved.

[0010] In some embodiments, the rolling member is configured to roll the battery cell of the square shell, and the length dimension of the roller body part is configured to be less than one-third of the width of the large surface of the battery cell. Such a design method enables the acting force applied by the rolling member to be more concentrated at the central position of the surface of the battery cell, so that a greater deformation can occur at the central position of the surface of the battery cell corresponding to the central position of the bare battery core, which is beneficial to improving the breaking efficiency of the liquid sealing phenomenon at the central position of the bare battery core and enabling a better electrolyte infiltration effect at the central position of the bare battery core.

[0011] In some embodiments, the diameter of the roller body part is less than or equal to 3.5 cm. By limiting the diameter of the roller body part within a relatively small numerical range, the distance dimension passed by the roller body part in one revolution of rolling is relatively small, that is, when the surface of the battery cell is rolled by the rolling member, more rotation cycles of the roller body part are required, reducing the control requirements for the traction part and improving the reliability of the battery infiltration device.

[0012] In some embodiments, the battery infiltration device further includes an electrolyte recovery assembly, which is configured to communicate with the liquid injection port of the battery cell and is used to collect the extruded electrolyte when the rolling member rolls the battery cell. By providing the electrolyte recovery assembly to communicate with the liquid injection port of the battery cell, the electrolyte that may flow out of the liquid injection port due to extrusion during the rolling process of the rolling member can be recovered by the electrolyte recovery assembly, which can reduce the waste of electrolyte and improve the economic benefits of the battery infiltration device.

[0013] In some embodiments, the electrolyte recovery assembly includes a suction nozzle, a pipeline and a liquid storage tank connected in sequence, and the suction nozzle communicates with the liquid injection port. Such a design method can use the suction nozzle to improve the connection tightness with the liquid injection port of the battery cell, reduce the risk of the electrolyte recovery assembly falling off during the operation of the battery infiltration device, and improve the connection reliability between the electrolyte recovery assembly and the liquid injection port of the battery cell.

[0014] In some embodiments, the number of rolling members is plural. Between at least two rolling members, there is space for accommodating battery cells to form a rolling unit. The rolling members in the rolling unit roll two opposite surfaces of the battery cell. By rolling the surfaces of the battery cell through 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, and further break the liquid seal phenomenon at the middle position of the bare battery core more quickly and efficiently, with higher production efficiency and reliability.

[0015] In some embodiments, in the rolling unit, at least one roller body part is provided with a gravity sensor. By providing a gravity sensor in the roller body part, the rolling unit can then lift the battery cell for rolling. At this time, the gravity sensor can sense the weight change of the battery cell, and judge the loss of electrolyte in the battery cell when the rolling member is performing rolling through the weight change of the battery cell. Then, during the subsequent liquid filling process, electrolyte can be more accurately supplemented into the battery cell.

[0016] In a second aspect, an embodiment of the present application further provides a battery infiltration method, which is applied to the battery infiltration device provided in any of the foregoing embodiments. The battery infiltration method includes the following steps: Step S1, provide a battery cell after liquid injection. Step S2, control the rolling member to roll the surface of the battery cell at least once. By controlling the rolling member to roll the surface of the battery cell at least once, the liquid seal phenomenon at the center position of the bare battery core can be broken through the rolling of the roller body part, enabling the electrolyte to infiltrate the center position of the bare battery core, improving the infiltration effect of the electrolyte, and having a higher infiltration yield.

[0017] In some embodiments, the battery infiltration method further includes: Step S3, obtain the amount of electrolyte lost by the battery cell after being rolled by the rolling member. Step S4, perform liquid filling on the battery cell according to the lost amount of electrolyte. By setting the judgment process for the loss of electrolyte amount in Step S3 and compensating the electrolyte in the battery cell through Step S4, the electrode infiltration effect of the battery cell after rolling can be further improved.

[0018] In some embodiments, in step S3, the step of determining the amount of electrolyte lost by the battery cell after being rolled by the rolling member includes: Step S31, controlling at least two rolling members to jointly clamp the battery cell and separate the battery cell from the substrate. Step S32, obtaining the first weight data of the battery cell. Step S33, controlling the two rolling members to jointly extrude the battery cell and obtaining the second weight data when the extrusion is completed. Step S34, calculating the difference between the first weight data and the second weight data to obtain the weight of the lost electrolyte. Such a design method is simple and easy to implement, and the method of judging the loss of electrolyte by the weight change of the battery cell is adapted to the structure of the battery soaking device, which is beneficial to the saving of the battery cell production process and improves the production efficiency of the battery cell.

[0019] In some embodiments, after the step of providing the battery cell after liquid injection, the following steps are further included: Step S5, connecting the electrolyte recovery component with the liquid injection port of the battery cell. By setting the electrolyte recovery component to be connected with the liquid injection port of the battery cell, the electrolyte that may flow out of the liquid injection port due to extrusion during the rolling process of the rolling member can be recovered by using the electrolyte recovery component, which can reduce the waste of electrolyte and improve the economic benefits of the battery soaking device.

[0020] In some embodiments, in the step of the rolling member rolling the surface of the battery cell, there is at least one rolling process, and the rolling member moves from the end of the battery cell facing away from the liquid injection port in the direction close to the liquid injection port. That is, in the process of the rolling member rolling the surface of the battery cell, there is at least one rolling in the direction pointing to the liquid injection port to quickly discharge the gas trapped in the middle position of the bare battery core due to the liquid sealing phenomenon through the liquid injection port from the battery cell.

[0021] In a third aspect, an embodiment of the present application further provides a battery production system, and this battery production system includes the battery soaking device provided in any of the foregoing embodiments. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Schematic diagram of the overall flow direction of the electrolyte after flowing into the battery cell through the liquid injection port during liquid injection;

[0024] Figure 2 Schematic diagram of the liquid sealing phenomenon occurring in the bare battery core;

[0025] Figure 3 Explosion schematic diagram of the three-dimensional structure of a battery cell in the related art;

[0026] Figure 4 Stereoscopic schematic diagram of the cooperation structure between the battery infiltration device and the battery cell provided in an embodiment of the present application;

[0027] Figure 5 Schematic diagram of the cooperation structure between the rolling member and the electrolyte recovery assembly in the battery infiltration device provided in an embodiment of the present application and the battery cell;

[0028] Figure 6 Schematic diagram of the cooperation structure between the rolling member and the electrolyte recovery assembly in the battery infiltration device provided in another embodiment of the present application and the battery cell;

[0029] Figure 7 Flow chart of the battery infiltration method provided in an embodiment of the present application;

[0030] Figure 8 Flow chart of step S3 in the battery infiltration method provided in an embodiment of the present application.

[0031] Explanation of reference numerals: 200, battery cell; 201, housing; 202, electrode assembly; 203, end cap assembly; 2031, liquid injection port;

[0032] 100, battery infiltration device; 10, base; 20, rolling member; 21, traction part; 211, telescopic rod; 2111, first ball head; 2112, second ball head; 212, support frame; 22, roller body part; 30, electrolyte recovery assembly; 31, suction nozzle; 32, pipeline; 33, liquid storage tank. Detailed implementation manners

[0033] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0035] In addition, if there is a term "and / or", "and / or" is only a correlative relationship describing related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the related objects before and after. If there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present application, unless otherwise clearly specified and limited, if there are terms such as "installation", "connection", "connection", "fixation", etc., these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "above" or "below" a second feature, etc., the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0039] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific implementation manners of this application are specifically exemplified below.

[0040] In the field of new energy, as a power supply device, the battery can be used as the main power source of power-consuming devices such as electric vehicles, ships or spacecrafts, and its importance is self-evident. In this application, the battery can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. In some related technologies, the battery can also be referred to as a battery cell or an electrode core. In specific implementations, one or more batteries can form a battery module or a battery pack to provide a higher voltage and capacity to the power-consuming device. Optionally, the battery pack can include a box for encapsulating one or more batteries. The box can reduce the influence of liquid or other foreign objects on the charging or discharging of the battery.

[0041] In this application, the battery can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of this application do not limit this. In addition, the battery is generally divided into two types according to the encapsulation method: cylindrical batteries and square batteries, and the embodiments of this application also do not limit this.

[0042] The development of battery technology needs to consider various design factors at the same time. For example, in order to improve the charging and discharging performance of the battery, various types of performance parameters such as the energy density, cycle life, discharge capacity, and charge-discharge rate of the battery need to be considered. In addition, the manufacturing efficiency and manufacturing performance of the battery are also crucial for the popularization, application and long-term development of the battery.

[0043] A battery generally includes a housing, an electrode assembly, and an electrolyte. Among them, the housing can be used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The electrolyte, as an electrolyte, can conduct ions between the positive electrode sheet and the negative electrode sheet of the electrode assembly, thereby enabling the normal operation of the battery. For a lithium battery, the electrolyte therein can include lithium salts and organic solvents, etc.

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

[0045] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic diagram of the overall flow direction of the electrolyte after flowing into the battery cell through the liquid injection port during liquid injection; Figure 2 which is a schematic diagram of the liquid sealing phenomenon occurring in the bare battery cell.

[0046] In the related art, during the liquid injection process of the battery, after the electrolyte is injected through the liquid injection port, it will first flow to the periphery of the bare battery cell and infiltrate the periphery of the bare battery cell. Then, it will first infiltrate and fill the gaps between the electrode sheets and the diaphragm at the periphery of the bare battery cell, as well as the microporous structure inside the electrode sheets. However, the gas originally present in the middle part of the bare battery cell is difficult to discharge because the periphery of the bare battery cell has been infiltrated. As a result, the middle part of the bare battery cell is difficult to be infiltrated by the electrolyte due to the liquid sealing phenomenon, resulting in poor infiltration at the middle position of the bare battery cell. During the subsequent use process of the battery, the gas remaining in the central part of the bare battery cell will continuously hinder the infiltration of the electrolyte into the electrode sheets in the middle part, thereby blocking the ion path, making it easy for lithium deposition to occur in the central part of the bare battery cell during the cycling process of the battery.

[0047] In view of this, the embodiments of the present application provide a battery infiltration device, method, and battery production system, which are applied to a battery with a liquid injection port. This battery infiltration device is used to improve the electrolyte infiltration effect of a hard-shell battery cell and includes a base body and a rolling member. The rolling member includes a traction part and a roller body part. Among them, the traction part is arranged on the base body, and the roller body part is arranged on the traction part. The traction part is configured to control the movement of the roller body part, thereby rolling the surface of the battery cell. Through the technical solution of the embodiments of the present application, the traction part can be used to control the roller body part to roll the surface of the battery cell, thereby destroying the liquid sealing phenomenon at the central position of the bare battery cell through the rolling of the roller body part, enabling the electrolyte to infiltrate the central position of the bare battery cell, improving the infiltration effect of the electrolyte, and having a higher infiltration yield.

[0048] The technical solutions described in the embodiments of the present application are applicable to the batteries in various electrical devices. For example, electric vehicles, battery cars, power tools, ships, spacecraft, etc. Among them, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc. It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applicable to the batteries of all electrical devices.

[0049] Please refer to Figures 1 to 3 , Figure 3 which is an exploded perspective view of a battery cell in the related art.

[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 an outer shell or a battery case. The housing 201 can be formed of metal (such as aluminum). The housing 201 is determined according to the shape of one or more combined electrode assemblies 202.

[0051] The housing 201 has an opening. The electrode assembly 202 is accommodated in the housing 201. The end cap assembly 203 is used to cover the opening to accommodate the electrode assembly 202 in the housing 201. Through the housing 201 and the end cap assembly 203, the accommodation and protection of the electrode assembly 202 and other components are realized. The housing 201 is filled with an electrolyte, that is, an electrolytic solution.

[0052] In the battery cell 200 provided in the embodiments of the present application, according to actual usage requirements, the electrode assembly 202 can be set to be single or multiple. For example, in Figure 3 the illustrated embodiment, one electrode assembly 202 is provided in the battery cell 200.

[0053] Continuing to refer to Figure 3 as shown, the housing 201 can be a structure with one end open or a structure with both ends open. Therefore, the end cap assembly 203 can be provided at one end of the housing 201, or can include two parts respectively provided at the two opening positions of the housing 201. Positive and negative electrode terminals are usually provided on the end cap. The electrode assembly 202 is provided with tabs. Among them, 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, a liquid injection port 2031 can also be provided on the above-mentioned end cap assembly 203. For example, in Figure 3 the illustrated embodiment, a liquid injection port 2031 is provided at the central part of the end cap assembly 203. During the liquid injection process of the battery cell 200, an external liquid injection tool can be set at the liquid injection port 2031 to inject electrolytic solution into the battery cell 200.

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

[0056] In addition, Figure 3 The battery cell 200 shown in [reference] is described by taking a square shell battery as an example. The battery provided in the present application may also be a cylindrical battery or a battery of other shapes. In a cylindrical battery, its components may be similar to those of the battery cell 200 shown above. Figure 3 The housing of the cylindrical battery may be a hollow cylindrical housing.

[0057] Please refer to Figures 1 to 6 , Figure 4 which is a three-dimensional schematic diagram of the cooperation structure between a battery infiltration device and a battery cell provided in an embodiment of the present application; Figure 5 which is a schematic diagram of the cooperation structure between a rolling member and an electrolyte recovery assembly in a battery infiltration device and a battery cell provided in an embodiment of the present application; Figure 6 which is a schematic diagram of the cooperation structure between a rolling member and an electrolyte recovery assembly in a battery infiltration device and a battery cell provided in another embodiment of the present application.

[0058] The embodiments of the present application provide a battery infiltration device 100, which is used to improve the electrolyte infiltration effect of a hard-shell battery cell 200. The battery infiltration device 100 includes a base body 10 and a rolling member 20. Among them, the rolling member 20 includes a traction part 21 and a roller body part 22. The traction part 21 is arranged on the base body 10, and the roller body part 22 is arranged on the traction part 21. The traction part 21 is configured to drive the roller body part 22 to move, so as to roll the surface of the battery cell 200.

[0059] The function of the battery infiltration device 100 is to improve the liquid sealing phenomenon of the battery cell 200 after liquid injection, discharge the gas in the central part of the bare battery core, and enable the electrolyte to infiltrate the central part of the bare battery core. In these embodiments of the present application, the battery infiltration device 100 is mainly used to roll a hard-shell battery cell 200 to eliminate the liquid sealing phenomenon in the middle of the battery cell 200 and improve the effect of the electrode assembly 202 being infiltrated by the electrolyte.

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

[0061] The substrate 10 serves as the supporting structure of the battery infiltration device 100, and is used to support and carry the rolling member 20 and the battery cell 200 after the injection of electrolyte. In these embodiments of the present application, the substrate 10 may, but is not limited to, be a plate-like structure, a block-like structure, etc. At the same time, the substrate 10 may be a structure fixed on the battery production line, or a structure that can change its installation position by moving or disassembling.

[0062] The rolling member 20 is a component in the battery infiltration device 100 that actually contacts the battery cell 200, and is used to discharge the gas remaining in the central position of the battery cell 200 due to the liquid seal phenomenon alone or in cooperation with the substrate 10, so that the central part of the bare battery core can be well infiltrated by the electrolyte.

[0063] The rolling member 20 includes a traction part 21 and a roller body part 22. Among them, the traction part 21 is a component in the rolling member 20 used to control the rolling direction or the rolling pressure, and the roller body part 22 is the component in the rolling member 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 press 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 central part of the bare battery core due to the liquid seal phenomenon is gradually extruded from the central part of the bare battery core and finally discharged from the battery cell 200 through the injection port.

[0064] In this way, the liquid seal phenomenon in the central part of the bare battery core can be eliminated, so that the electrolyte can further infiltrate the central part of the bare battery core, thereby improving the phenomenon that lithium deposition is likely to occur in the central part of the bare battery core during the cycle of the battery cell 200, and enhancing the stability of the battery cell 200 during the cycle.

[0065] The roller body part 22 is arranged on the traction part 21, and the traction part 21 is configured to drive the roller body part 22 to move, which means that the roller body part 22 cooperates with the traction part 21 so that the roller body part 22 can generate displacement under the drive of the traction part 21, and then use the roller body part 22 to break the liquid seal phenomenon in the battery cell 200.

[0066] It should be noted that the traction part 21 may or may not include a power source. In the embodiments where the traction part 21 includes a power source, the traction part 21 can work under the drive of its own power source, and then drive the roller body part 22 to roll the surface of the battery cell 200; while in the embodiments where the traction part 21 does not include a power source, the traction part 21 can also be connected to an external power element and serve as the power transmission mechanism of the external power element to drive the roller body part 22 to roll the surface of the battery cell 200.

[0067] The roller body part 22 is arranged on the traction part 21. A possible implementation manner is that the roller body part 22 can be detachably connected to the traction part 21 by means such as snap connection or connection with connecting parts (screws, bolts, etc.), so as to facilitate the subsequent maintenance and replacement of the roller body part 22 or the traction part 21; or, in some embodiments, it can also be set that the roller body part 22 and the traction part 21 are connected by fixed connection methods such as welding and bonding, so as to improve the structural consistency between the roller body part 22 and the traction part 21 and enhance the structural reliability of the roller pressing member 20.

[0068] The traction part 21 is arranged on the base body 10. A possible implementation manner is that the base body 10 is provided with a structure for installing the traction part 21. During the production and assembly stage of the battery soaking device 100, the traction part 21 can be installed and formed with the base body 10 by assembling; or, in some embodiments, it can also be set that part of the structure of the traction part 21 and the base body 10 are formed by means such as gluing, welding or even integral molding to realize the connection between the traction part 21 and the base body 10.

[0069] After the traction part 21 is arranged on the base body 10, the position on the base body 10 close to the traction part 21 is the placement position of the battery cell 200 (which needs to be determined according to the range in which the traction part 21 controls the operation of the roller pressing member 20). During the working process of the battery soaking device 100, the battery cell 200 that has been filled with liquid can be first placed on the position of the base body 10 close to the traction part 21, and then by controlling the operation of the traction part 21, the roller body part 22 is driven to roll-press the surface of the battery cell 200.

[0070] The roller pressing member 20 rolls-presses the surface of the battery cell 200, so that the shell of the battery cell 200 generates a certain elastic deformation through the roller pressing member 20, making the internal structure of the battery cell 200 more compact, and further destroying the liquid sealing phenomenon in the middle part of the bare battery core.

[0071] In these embodiments of the present application, the roller pressing member 20 needs to be adapted to the surface of the battery cell 200 to obtain a better roller pressing effect. Exemplarily, in the embodiment where the battery cell 200 is a square shell battery, the roller body part 22 in the roller pressing member 20 can be set to be cylindrical, so as to obtain a good and uniform roller pressing effect when rolling-pressing the square shell battery; in the embodiment where the battery cell 200 is a cylindrical battery, the roller body part 22 can be set to be recessed from the central position along the axis towards the direction close to the axis, forming an annular groove matching the outer surface of the cylindrical battery. Then, when using the roller pressing member 20 to roll-press the cylindrical battery, the outer surface of the cylindrical battery can be clamped into the aforementioned groove, and the outer surface of the cylindrical battery can be rolled-pressed more evenly.

[0072] In an embodiment where the battery cell 200 is a square - case battery, the rolling member 20 can be arranged to act on the large surface of the battery cell 200. By extruding with the large surface of the battery cell 200, a greater deformation of the battery cell 200 can be obtained, increasing the probability of the rolling member 20 breaking the liquid - sealing phenomenon in the middle part of the bare battery core. At the same time, it is also beneficial to set the rolling direction. By rolling the surface of the battery cell 200 in each rolling direction, the gas - discharging effect can be further improved, and the bare battery core can be better wetted.

[0073] In some embodiments of the present application, a single rolling member 20 can be arranged to cooperate with the structure of the base body 10 to roll the battery cell 200, or at least two rolling members 20 can be arranged to cooperate with each other to roll the battery cell 200.

[0074] Exemplarily, in some embodiments, the base body 10 can be arranged as a structure including a bottom wall and side walls (not shown in the figure). After the battery cell 200 is filled with liquid, the battery cell 200 can be placed at the connection of the bottom wall and the side walls, so that one large surface of the battery cell 200 is attached to the side wall. At this time, the rolling member 20 can be arranged at the other large surface of the battery cell 200, and a rolling operation can be performed on this large surface of the battery cell 200.

[0075] In some embodiments, the number of the rolling members 20 can be set to be multiple, and the multiple rolling members 20 form an annular structure on the base body 10. At this time, the battery cell 200 can be placed in the annular structure, and multiple rolling members 20 can be controlled to roll the battery cell 200 from different directions simultaneously.

[0076] In some embodiments of the present application, the battery cell 200 can be fixed by arranging structures such as a card slot and a fastener on the base body 10 after the battery cell 200 is placed; in some embodiments, the base body 10 can also not be provided with a fixing structure for the battery cell 200, but only be used to carry the battery cell 200.

[0077] According to the battery wetting device 100 provided by the embodiments of the present application, by arranging that the rolling member 20 includes a traction part 21 and a roller body part 22, and the traction part 21 is arranged on the base body 10, the roller body part 22 can be controlled by the traction part 21 to roll the surface of the battery cell 200. Then, the liquid - sealing phenomenon at the center position of the bare battery core is destroyed through the rolling of the roller body part 22, so that the electrolyte can wet the center position of the bare battery core, improving the wetting effect of the electrolyte and having a higher wetting yield.

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

[0079] The telescopic rod 211 is a power component in the rolling member 20. By controlling the telescopic movement of the telescopic rod 211, the distance between the roller body portion 22 and the battery cell 200, the force applied to the battery cell 200 after contacting the battery cell 200, etc. can be adjusted.

[0080] The function of the support frame 212 is to install the roller body portion 22 and enable a good and reliable connection between the roller body portion 22 and the traction portion 21. Among them, the roller body portion 22 is rotatably connected to the support frame 212, which means that at least part of the structure of the support frame 212 is rotatably connected to both circumferential ends of the roller body portion 22, so that the roller body portion 22 is connected to the support frame 212 and can rotate relative to the support frame 212.

[0081] In some embodiments of the present application, it can be set that the driving of the telescopic rod 211 is realized by a cylinder. In some embodiments, it can also be set that the telescopic rod 211 is a rack and pinion structure or a screw telescopic structure driven by a motor.

[0082] Both ends of the telescopic rod 211 are respectively connected to the support frame 212 and the base body 10, so as to drive the roller body portion 22 to move in a direction close to or away from the base body 10 through the telescopic rod 211, thereby changing the contact state (contact or non-contact) between the roller body portion 22 and the battery cell 200, and the force applied by the roller body portion 22 to the battery cell 200.

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

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

[0085] Among them, the rotational connection between the telescopic rod 211 and the base body 10 means that the angle between the telescopic rod 211 and the base body 10 (the surface for installing the telescopic rod 211) is adjustable, and thus the telescopic direction of the telescopic rod 211 can be changed, and further the effect of adjusting the position of the roller body portion 22 acting on the battery cell 200 or adjusting the force of the roller body portion 22 acting on the battery cell 200 can be achieved.

[0086] The rotational 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, and thus the contact angle between the support frame 212 and the battery cell 200 can be adjusted, so that the roller body portion 22 can better contact and roll on the surface of the battery cell 200, and the risk of contact between the support frame 212 and the battery cell 200 is reduced.

[0087] According to the battery infiltration device 100 provided by the embodiments of the present application, such a design method improves the angle adjustment ability of the rolling member 20, enables the rolling member 20 to roll the surface of the battery cell 200 in different directions, and is beneficial to improving the discharge rate of the gas sealed in the bare battery core.

[0088] In some embodiments, the telescopic rod 211 includes a first ball head 2111 disposed at one end facing away from the support frame 212. The base body 10 includes a first card slot (not shown in the figure). The first ball head 2111 is clamped in the first card slot, and the telescopic rod 211 is configured to be able to rotate circumferentially with the first ball head 2111 as the rotation center.

[0089] The setting of the first ball head 2111 further improves the angle adjustment ability between the telescopic rod 211 and the base body 10, enables the telescopic rod 211 to obtain a greater degree of rotational freedom relative to the base body 10, and further provides the possibility for the telescopic rod 211 to control the roller body portion 22 to roll the battery cell 200 in different directions.

[0090] In these embodiments of the present application, the direction of the telescopic rod 211 pointing to the battery cell 200 can be adjusted by the rotation of the first ball head 2111 in the first card slot, and then the roller body portion 22 can be controlled to roll the large surface of the battery cell 200 obliquely, and the inclination 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 central part of the bare battery core can be further improved, and the reliability of the battery infiltration device 100 is further improved.

[0091] It should be noted that in these embodiments of the present application, a combined component of a universal joint and a limiting device can be set between the first ball head 2111 and the first card slot, that is, by setting an adjustable damper or brake on the universal joint (the first ball head 2111), or by setting a mechanical limiting structure outside the universal joint, so that after the first ball head 2111 realizes angle adjustment, it can self-position and will not change the angle significantly, so as to improve the stability when the telescopic rod 211 drives the roller body portion 22 to roll. Of course, in some embodiments, it is also possible to set that there is no positioning or braking component between the first ball head 2111 and the first card slot, and the stability of the telescopic rod 211 after changing the orientation or angle with the base body 10 can be improved by setting a telescopic bracket connected to the telescopic rod 211.

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

[0093] The provision of the second ball head 2112 enhances the angle adjustment ability between the telescopic rod 211 and the support frame 212, enabling the support frame 212 to adapt to the telescopic rod 211. When the angle between the telescopic rod 211 and the base body 10 changes, the orientation of the support frame 212 (roller body part 22) on the surface of the battery cell 200 can be adjusted accordingly, thereby changing the rolling direction of the rolling member 20 more smoothly.

[0094] In some embodiments of the present application, both ends of the telescopic rod 211 are respectively provided with a first ball head 2111 and a second ball head 2112. The telescopic rod 211 is connected to the base body 10 and the support frame 212 through the first ball head 2111 and the second ball head 2112 respectively. Thereby, the angle adjustment ability of the rolling member 20 is greatly enhanced, enabling the rolling member 20 to roll the battery cell 200 in a more appropriate direction and with a more appropriate force, achieving the effect of breaking the liquid seal phenomenon in the central part of the bare battery core.

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

[0096] The length dimension of the roller body part 22 refers to the dimension along the axial direction of the roller body part 22. In these embodiments of the present application, by setting the length dimension of the roller body part 22 to be less than one-third of the width of the large surface of the battery cell 200, the force exerted by the roller body part 22 on the battery cell 200 can be more concentrated on the central part of the large surface of the battery cell 200, making the battery cell 200 more likely to undergo elastic deformation, and extruding the residual gas in the central part of the bare battery core through rolling, thereby improving the electrolyte infiltration effect of the bare battery core.

[0097] Exemplarily, in these embodiments of the present application, the ratio of the length dimension of the roller body part 22 to the width of the large surface of the battery cell 200 can be set to 1:4, 1:5, or 1:6. Such a design method is beneficial to improving the breaking efficiency of the liquid seal phenomenon at the central position of the bare battery core and obtaining a better electrolyte infiltration effect at the central position of the bare battery core.

[0098] In some embodiments, the diameter of the roller body part 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 part 22 within a relatively small value range, the distance dimension passed by the roller body part 22 in one rolling cycle is smaller. That is, when rolling the surface of the battery cell 200 through the rolling member 20, more rotation cycles of the roller body part 22 are required, reducing the control requirements for the traction part 21 and improving the reliability of the battery infiltration device.

[0100] That is, in an embodiment where the diameter of the roller body portion 22 is designed to be relatively large, such as when the roller body portion 22 rolls a quarter turn and can roll from one side of the large surface of the battery cell 200 to the other side, the traction portion 21 needs to more precisely control the rolling distance of the roller body portion 22, and there is a risk that the roller body portion 22 detaches from the battery cell 200 or the roller pressure acts excessively on the periphery of the battery cell 200.

[0101] Exemplarily, the diameter of the roller body portion 22 can be but is not limited to 3.2 cm, 2.8 cm, 2.5 cm, or 2.0 cm.

[0102] In some embodiments, the battery infiltration device 100 further includes an electrolyte recovery assembly 30, and the electrolyte recovery assembly 30 is configured to communicate with the liquid injection port 2031 of the battery cell 200 and is used to collect the extruded electrolyte when the rolling member 20 rolls the battery cell 200.

[0103] The electrolyte recovery assembly 30 is used to communicate with the liquid injection port 2031 of the battery cell 200 to collect the extruded electrolyte when the rolling member 20 rolls the battery cell 200.

[0104] It can be understood that the electrolyte recovery assembly 30 being configured to communicate with the liquid injection port 2031 of the battery cell 200 means that the electrolyte recovery assembly 30 is at least provided with a pipeline structure and a storage structure, and the pipeline structure of the electrolyte recovery assembly 30 communicates with the liquid injection port 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 extruded and flowing out.

[0105] In some embodiments, the number of storage structures in the electrolyte recovery assembly 30 can be set to one, while the number of pipeline structures is multiple. The multiple pipeline structures are respectively used to communicate with the liquid injection ports 2031 of different battery cells 200 and respectively introduce the extruded electrolytes in different battery cells 200 into the storage structure; in some embodiments, the number of storage structures and pipeline structures in the electrolyte recovery assembly 30 can also be set to one. At this time, the number of electrolyte recovery assemblies 30 can be set to be multiple, and one electrolyte recovery assembly 30 is used to be correspondingly arranged with one battery cell 200 to store the extruded electrolyte in this battery cell 200.

[0106] In these embodiments of the present application, the storage structure of the electrolyte recovery assembly 30 can be but is not limited to being in a bag shape or a cylindrical shape.

[0107] According to the battery soaking device 100 provided by the embodiments of the present application, by arranging the electrolyte recovery component 30 to communicate with the liquid injection port 2031 of the battery cell 200, the electrolyte that may flow out from the liquid injection port 2031 due to extrusion during the rolling process of the rolling member 20 can be recovered by using the electrolyte recovery component 30, which can reduce the waste of electrolyte and improve the economic benefits of the battery soaking device.

[0108] In some embodiments, the electrolyte recovery component 30 includes a suction nozzle 31, a pipeline 32, and a liquid storage tank 33 that are connected in sequence, and the suction nozzle 31 communicates with the liquid injection port 2031.

[0109] The setting of the suction nozzle 31 can improve the connection tightness between the electrolyte recovery component 30 and the liquid injection port 2031 of the battery cell 200, and realize the quick connection between the electrolyte recovery component 30 and different battery cells 200 by quickly inserting and removing the suction nozzle 31 on the production line.

[0110] In these embodiments of the present application, the suction nozzle 31 can be set to be made of rubber materials such as ethylene propylene diene monomer rubber, fluororubber, or perfluoroether rubber, or silicone material, so as to obtain good elasticity and toughness on the premise of having good chemical stability. In this way, during the design process of the suction nozzle 31, the end of the suction nozzle 31 facing away from the liquid storage tank 33 can be designed to have a bayonet structure, and then the connection with the liquid injection port 2031 of the battery cell 200 can be realized by plugging and unplugging.

[0111] In some embodiments, the suction nozzle 31 can also be set to be made of materials such as metal and ceramic to obtain a certain structural strength. At this time, a thread structure can be provided on the outer surface of the suction nozzle 31, and then the connection between the electrolyte recovery component 30 and the battery cell 200 can be realized through the threaded connection with the liquid injection port 2031.

[0112] According to the battery soaking device 100 provided by the embodiments of the present application, the connection tightness between the suction nozzle 31 and the liquid injection port 2031 of the battery cell 200 can be improved, the risk of the electrolyte recovery component 30 falling off during the operation of the battery soaking device 100 can be reduced, and the connection reliability between the electrolyte recovery component 30 and the liquid injection port 2031 of the battery cell 200 can be improved.

[0113] In some embodiments, the number of rolling members 20 is multiple, and at least two rolling members 20 are used to accommodate the battery cell 200 to form a rolling unit, and the rolling members 20 in the rolling unit roll the two opposite surfaces of the battery cell 200.

[0114] The number of the rolling members 20 is multiple, which means that in the battery impregnation device 100, a single substrate 10 can support multiple rolling members 20, wherein the multiple rolling members 20 can be paired so that at least two rolling members 20 are used to accommodate battery cells 200 to form a rolling unit.

[0115] For example, in some embodiments, a plurality of rolling members 20 are disposed on the substrate 10, wherein the plurality of rolling members 20 are paired in pairs to form a rolling unit. In a single rolling unit, the telescopic rods 211 in two rolling members 20 have opposite telescopic directions to jointly roll the battery cell 200 placed between the two rolling members 20.

[0116] In this way, at least two rolling members 20 on the base 10 roll a single battery cell 200 together, that is, the rolling unit rolls the battery cell 200. The rolling members 20 in the rolling unit roll two opposite surfaces of the battery cell 200, so that the rolling effect of the battery cell 200 can be further improved through the joint action of each rolling member 20.

[0117] For example, in an embodiment where the battery cell 200 is a square shell battery, at least two rolling members 20 may be provided to roll the battery cell 200 from two large surfaces of the battery cell 200, respectively, so that one rolling member 20 acts on one large surface of the battery cell 200, and the other rolling member 20 acts on the other large surface of the battery cell 200 at the same time, so that the two opposite sides of the bare cell are squeezed at the same time, thereby further enhancing the squeezing effect on the center of the bare cell, which is more conducive to breaking the liquid sealing effect in the center of the bare cell.

[0118] It should be noted that in these embodiments of the present application, it is necessary to control the two rolling members 20 in the rolling unit for rolling on opposite sides of the battery cell 200, and the movement trajectories of the two rolling members 20 need to be controlled to be mirror-symmetrical so that the two rolling members 20 always form a common extrusion effect on the two opposite sides of the battery cell 200 during operation.

[0119] In some embodiments, at least one roller body 22 of the rolling unit is provided with a gravity sensor. This means that in these embodiments of the present application, the rolling unit can be provided so that when rolling the battery cell 200, the rolling members 20 in the rolling unit work together to lift the battery cell 200 to separate 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 by the rolling unit, the weight data of the battery cell 200 can be recorded once after the rolling unit lifts the battery cell 200, and once again after the rolling process is completed. By comparing the difference in the weight data of the battery cell 200 before and after rolling, the weight data of the electrolyte lost by the battery cell 200 during the rolling process can be obtained, and thus the electrolyte can be replenished more accurately in the subsequent electrolyte replenishment process.

[0121] Please refer to Figures 1 to 8 , Figure 7 which is a flowchart of a battery soaking method provided by an embodiment of the present application; Figure 8 which is a flowchart of step S3 in the battery soaking method provided by an embodiment of the present application.

[0122] The embodiment of the present application also provides a battery soaking method, which includes the following steps:

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

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

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

[0126] The purpose of this step is to roll the surface of the battery cell 200 through the rolling member 20, and then apply a force from the outer surface of the battery cell 200 to the center position of the bare battery core to achieve the purpose of breaking the liquid seal phenomenon at the center position of the bare battery core.

[0127] In these embodiments of the present application, rolling the surface of the battery cell 200 through the rolling member 20 at least once means that the number of rolling times can be designed according to factors such as the type of the battery cell and the size ratio between the rolling member 20 and the battery cell 200, as long as the liquid seal phenomenon at the center position of the bare battery core can be broken.

[0128] Exemplarily, in embodiments where the size of the battery cell 200 is relatively large or the elastic modulus of the housing 201 is relatively small, the outer coating texture of the battery cell 200 is relatively soft. At this time, the liquid seal phenomenon at the center position of the bare battery core can be broken by rolling a small number of times. At this time, the number of rolling times can be set to one, two, or three.

[0129] In an embodiment where the elastic modulus of the battery cell 200 is relatively large, the rolling times of the rolling member 20 on the battery cell 200 can be appropriately increased, and the rolling effect on the battery cell 200 can be improved by simultaneously rolling the battery cell 200 with multiple rolling members 20 and other methods.

[0130] According to the battery infiltration method provided by the embodiments of the present application, by controlling the rolling member 20 to roll the surface of the battery cell 200 at least once, the liquid sealing phenomenon at the center position of the bare battery core can be destroyed through the rolling of the rolling body portion 22, so that the electrolyte can infiltrate the center position of the bare battery core, improving the infiltration effect of the electrolyte and having a higher infiltration yield.

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

[0132] The purpose of this step is to obtain the amount of electrolyte lost by the battery cell 200 due to the extrusion effect after being affected by the rolling member 20, so as to facilitate subsequent replenishment of the battery cell 200. A possible implementation method is to collect the electrolyte flowing out of the injection port 2031 when each battery cell 200 is rolled by the rolling member 20 and measure the volume or weight of this part of the electrolyte to obtain the amount of electrolyte lost by the battery cell 200; alternatively, the battery cell 200 can also be weighed, and the weight difference of the battery cell 200 before and after rolling can be used to judge the lost weight of the electrolyte.

[0133] Exemplarily, in these embodiments of the present 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 base body 10 for receiving each battery cell 200, and then the amount of lost electrolyte can be judged.

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

[0135] Step S4, replenishing the battery cell 200 according to the amount of lost electrolyte.

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

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

[0138] Step S31: Control at least two rolling members 20 to jointly clamp the battery cell 200 and separate the battery cell 200 from the base body.

[0139] In this step, it is intended to roll the battery cell 200 by the rolling unit. The rolling unit may include a plurality of rolling members 20. At least two of the plurality of rolling members 20 jointly clamp the battery cell 200 to separate the battery cell 200 from the base body 10.

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

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

[0142] That is to say, in the embodiments where the gravity sensor is arranged on the base body 10, since each gravity sensor is arranged on the base body 10, the supporting positions of adjacent battery cells 200 on the base body 10 may affect their respective gravity sensors after the battery cells 200 are placed. In these embodiments of the present application, by arranging the gravity sensor on the rolling member 20 and obtaining the weight data after separating the battery cell 200 from the base body 10 through step S31, the aforementioned influence on the acquisition of weight data can be reduced, making the acquired weight data of the battery cell 200 more accurate and reliable.

[0143] It can be known that the first weight data is the weight data of the battery cell 200 after the injection of electrolyte is completed.

[0144] Step S33: Control two rolling members 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 is intended to obtain the weight data of the battery cell 200 after the rolling member 20 completes the rolling work on the battery cell 200. At this time, if there is a situation where electrolyte flows out when the rolling member 20 rolls the battery cell 200, 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] In this step, by calculating the difference between the first weight data and the second weight data, the weight of the lost electrolyte can be obtained. Subsequently, when replenishing the electrolyte, an electrolyte with a weight portion not less than the difference between the first weight data and the second weight data can be replenished into the battery cell 200 through the liquid injection port 2031, so that the electrode assembly 202 can work in a filled electrolyte environment, improving the reliability of the battery cell 200.

[0148] It can be understood that after the liquid replenishment process is completed, the liquid injection port 2031 can be sealed by a seal 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 liquid injection, the following steps are further included: Step S5, connecting the electrolyte recovery assembly 30 to the liquid injection port 2031 of the battery cell 200.

[0150] The electrolyte recovery assembly 30 is used to be connected to the liquid injection port 2031 of the battery cell 200 to collect the extruded electrolyte when the rolling member 20 rolls the battery cell 200.

[0151] In these embodiments of the present application, the number of storage structures in the electrolyte recovery assembly 30 can be set to one, while the number of pipeline structures is multiple. The multiple pipeline structures are respectively used to be connected to the liquid injection ports 2031 of different battery cells 200 and respectively introduce the extruded electrolyte in different battery cells 200 into the storage structure; in some embodiments, the number of storage structures and pipeline structures in the electrolyte recovery assembly 30 can also be set to one. At this time, the number of electrolyte recovery assemblies 30 can be set to multiple, and one electrolyte recovery assembly 30 is used to be correspondingly arranged with one battery cell 200 to store the extruded electrolyte in the battery cell 200.

[0152] According to the battery soaking device 100 provided by the embodiments of the present application, by setting the electrolyte recovery assembly 30 to be connected to the liquid injection port 2031 of the battery cell 200, the electrolyte that may flow out from the liquid injection port 2031 due to extrusion during the rolling process of the rolling member 20 can be recovered by using the electrolyte recovery assembly 30, which can reduce the waste of the electrolyte and improve the economic benefits of the battery soaking device.

[0153] In some embodiments, in the step of the rolling member 20 rolling the surface of the battery cell 200, there is at least one rolling process, and the rolling member 20 moves from one 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, in the process of the rolling member 20 rolling the surface of the battery cell 200, there is at least one rolling process in the direction pointing to the liquid injection port 2031, so as to quickly discharge the gas trapped in the middle position of the bare battery cell due to the liquid sealing phenomenon from the battery cell 200 through the liquid injection port 2031.

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

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

[0157] The embodiments of the present application also provide a battery production system, and this battery production system includes the battery soaking device 100 provided in any of the foregoing embodiments.

[0158] According to some embodiments of the present application, please refer to Figures 1 to 8 , the embodiments of the present application provide a battery soaking device 100. This battery soaking device 100 includes a base body 10, a rolling member 20 and an electrolyte recovery assembly 30. Among them, the rolling member 20 includes a traction part 21 and a roller body part 22. The traction part 21 is arranged on the base body 10, and the roller body part 22 is arranged on the traction part 21. The traction part 21 is configured to control the movement of the roller body part 22, and then roll the surface of the battery cell 200.

[0159] The base body 10 is the supporting structure of the battery soaking device 100, and is used to support and carry the rolling member 20 and the battery cell 200 after liquid injection is completed. In these embodiments of the present application, the base body 10 can be, but is not limited to, a plate-like structure, a block-like structure, etc. At the same time, the base body 10 can be a structure fixed on the battery production line, or a structure that can change the installation position by moving or disassembling.

[0160] The rolling member 20 is a component in the battery soaking device 100 that actually contacts the battery cell 200, and is used to discharge the gas remaining in the center position of the battery cell 200 due to the liquid sealing phenomenon alone or in cooperation with the base body 10, so that the central part of the bare battery cell can be well infiltrated by the electrolyte.

[0161] The rolling member 20 includes a traction portion 21 and a roller body portion 22. Among them, the traction portion 21 is a component in the rolling member 20 for controlling the rolling direction and rolling pressure, and the roller body portion 22 is the component in the rolling member 20 that actually contacts the battery cell 200. It can be understood that the roller body portion 22 can roll along its own axis. By controlling the traction portion 21, the roller body portion 22 contacts and presses the surface of the battery cell 200. At the same time, through the rolling action of the roller body portion 22 itself, the gas remaining in the central part of the bare battery core due to the liquid sealing phenomenon is gradually extruded from the central part of the bare battery core and finally discharged from the battery cell 200 through the liquid injection port.

[0162] In this way, the liquid sealing phenomenon in the central part of the bare battery core can be eliminated, so that the electrolyte can further infiltrate the central part of the bare battery core, so as to improve the phenomenon that lithium deposition is likely to occur in the central part of the bare battery core during the cycling process of the battery cell 200, and improve the stability of the battery cell 200 during the cycling process.

[0163] When the rolling member 20 rolls the battery cell 200, there is a possibility that the electrolyte flows out and is lost through the liquid injection port 2031 during the rolling process. Based on this, the electrolyte recovery assembly 30 is configured to communicate with the liquid injection port 2031 of the battery cell 200 and is used to collect the extruded electrolyte when the rolling member 20 rolls the battery cell 200.

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

[0165] The setting of the suction nozzle 31 can improve the connection tightness between the electrolyte recovery assembly 30 and the liquid injection port 2031 of the battery cell 200, and realize the quick connection between the electrolyte recovery assembly 30 and different battery cells 200 by quickly plugging and unplugging the suction nozzle 31 on the production line.

[0166] In these embodiments of the present application, the rolling direction, the number of rolling times, the rolling pressure of the rolling member 20 and the structural shape of the roller body portion 22 can be selected according to the size of the rolling member 20, the size of the battery cell 200 to be rolled, and the material selection of the battery cell 200 to be rolled, as long as the liquid sealing phenomenon in the central part of the bare battery core can be broken.

[0167] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0168] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery soaking device for improving the electrolyte soaking effect of a hard-shell battery cell, characterized in that include: matrix; The rolling member comprises a traction part and a roller body part, wherein the traction part is arranged on the base, and the roller body part is arranged on the traction part, and the traction part is configured to drive the roller body part to move, thereby rolling the surface of the battery cell.

2. The battery soaking device according to claim 1, wherein The traction part comprises a telescopic rod and a support frame, the roller body part is rotatably connected to the support frame, and two ends of the telescopic rod are respectively connected to the support frame and the base.

3. The battery soaking device according to claim 2, wherein The telescopic rod is rotatably connected to the base, and / or the telescopic rod is rotatably connected to the support frame.

4. The battery soaking device according to claim 3, wherein The telescopic rod includes a first ball head arranged at one end away from the support frame, the base includes a first slot, the first ball head is clamped in the first slot, and the telescopic rod is configured to be able to rotate circumferentially with the first ball head as the rotation center.

5. The battery soaking device according to claim 3, wherein The telescopic rod includes a second ball head arranged at one end close to the support frame, the support frame includes a second slot, the second ball head is clamped in the second slot, and the telescopic rod is configured to be able to rotate circumferentially with the second ball head as the rotation center.

6. The battery soaking device according to claim 1, wherein The rolling member is configured to roll the square-shelled battery cell, and the length of the rolling body is configured to be smaller than one third of the width of the major surface of the battery cell.

7. The battery soaking device 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 soaking device according to claim 1, characterized in that The battery impregnation device further includes an electrolyte recovery assembly, which is configured to be in communication with a liquid injection port of a battery cell and is used to collect the electrolyte pressed out when the rolling member rolls the battery cell.

9. The battery soaking device according to claim 8, wherein The electrolyte recovery component comprises a suction nozzle, a pipeline and a liquid storage tank which are connected in sequence, and the suction nozzle is communicated with the liquid injection port.

10. The battery soaking device according to any one of claims 1 to 9, characterized in that, There are multiple rolling members, and at least two of the rolling members are used to accommodate the battery cell to form a rolling unit. The rolling members in the rolling unit roll two opposite surfaces of the battery cell.

11. The battery soaking device according to claim 10, wherein, In the rolling unit, at least one of the roller bodies is provided with a gravity sensor.

12. A battery soaking method, applied to the battery soaking device according to any one of claims 1 to 11, characterized in that, The method comprises the following steps: Providing the battery cell after liquid injection; The rolling member is controlled to roll the surface of the battery cell at least once.

13. The battery soaking method according to claim 12, characterized in that, The method further comprises: Obtaining the amount of electrolyte lost by the battery cell after being rolled by the rolling member; The battery cells are replenished according to the amount of lost electrolyte.

14. The battery soaking method according to claim 13, wherein, The step of obtaining the amount of electrolyte lost by the battery cell after being rolled by the rolling member comprises: Controlling at least two of the rolling members to jointly clamp the battery monomer and separate the battery monomer from the base; Acquiring first weight data of the battery cell; controlling the two rolling members to jointly squeeze the battery cell, and obtaining second weight data of the battery cell when the squeezing is completed; The difference between the first weight data and the second weight data is calculated to obtain the weight of the lost electrolyte.

15. The battery soaking method according to claim 12, wherein, After providing the step of injecting the battery cell, the step further includes: The electrolyte recovery assembly is connected to the injection port of the battery cell.

16. The battery soaking method according to claim 12, characterized in that In the step of rolling the surface of the battery cell by the rolling member, there is at least one rolling process, and the rolling member moves from one end of the battery cell away from the liquid injection port in a direction close to the liquid injection port.

17. A battery production system, characterized in that, It includes the battery soaking device according to any one of claims 1 to 11.

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