Battery electrolyte injection fixtures and battery production lines

Abstract

This application relates to the field of battery production equipment technology, and discloses a battery electrolyte injection fixture and a battery production line. The battery electrolyte injection fixture includes a driving device, a first clamping part, a second clamping part, and a first heating device. The driving device is drivenly connected to the first clamping part and the second clamping part. One of the first clamping part and the second clamping part is provided with the first heating device, which is used to heat the corresponding clamping part. The first clamping surface of the first clamping part and the second clamping surface of the second clamping part are arranged opposite to each other. The battery cell has a first sidewall and a second sidewall along a first direction. When the first clamping part and the second clamping part clamp the battery cell, the first clamping surface abuts against the first sidewall, and the second clamping surface abuts against the second sidewall. The first heating device intermittently changes its relative position with respect to the corresponding sidewall of the battery cell along a second direction. The purpose of applying this technical solution is to promote the uniform wetting of electrolyte into the electrode assembly by heating the battery cell, thereby improving the wetting effect and wetting efficiency.

Description

Technical Field

[0001] This application belongs to the field of battery production equipment technology, and in particular relates to a battery liquid injection fixture and a battery production line. Background Technology

[0002] When the electrolyte is injected into the battery cell, due to the structural limitations of the electrode assembly—that is, the electrode assembly consists of multiple layers of tightly stacked electrodes forming a relatively dense structure—the electrolyte preferentially diffuses along the gap between the sides of the electrode assembly and the inner wall of the casing under the influence of gravity, making it difficult to effectively penetrate into the central region of the electrode assembly, resulting in uneven wetting of the electrode assembly. This uneven wetting leads to insufficient electrolyte distribution in the central region of the electrode assembly, which in turn causes performance defects such as increased internal resistance, capacity decay, and shortened cycle life.

[0003] The relevant technologies mainly rely on prolonged standing or slight agitation after electrolyte injection to promote wetting. However, the standing process is too time-consuming and has low production efficiency; slight agitation cannot overcome the obstruction of the dense structure of the electrode assembly, and has limited effect on improving the wetting of the central area of ​​the electrode assembly, and the problem of uneven electrolyte wetting still exists inside the electrode assembly. Utility Model Content

[0004] The purpose of this application is to provide a battery electrolyte injection fixture and a battery production line, which aims to promote the uniform wetting of electrolyte into the electrode assembly by heating the battery cells, thereby improving the wetting effect and efficiency.

[0005] To achieve the above objectives, according to a first aspect of the embodiments of this application, a battery liquid injection clamp is provided, including a driving device, a first clamping part, a second clamping part, and a first heating device. The driving device is drivenly connected to the first clamping part and the second clamping part. One of the first clamping part and the second clamping part is provided with the first heating device, which is used to heat a corresponding one of the first clamping part and the second clamping part. The first clamping part has a first clamping surface, and the second clamping part has a second clamping surface. The first clamping surface and the second clamping surface are disposed opposite to each other along a first direction. A battery cell has a first sidewall and a second sidewall along the first direction. When the first clamping part and the second clamping part clamp the battery cell, at least a portion of the first clamping surface abuts against at least a portion of the first sidewall, and at least a portion of the second clamping surface abuts against at least a portion of the second sidewall. The first heating device intermittently changes its relative position with respect to the corresponding sidewall of the battery cell along a second direction, which is perpendicular to the first direction.

[0006] The battery electrolyte injection fixture provided in this application uses a driving device to drive a first clamping part and a second clamping part to stably clamp the battery cell. A first heating device heats one of the clamping parts, transferring heat to the battery cell. Since the first heating device intermittently changes its relative position to the corresponding sidewall of the battery cell along a second direction, it can heat any position on the corresponding sidewall of the battery cell, thus covering the entire sidewall area and raising the temperature of the electrolyte inside the battery cell. This reduces the viscosity of the electrolyte, enhancing its fluidity and penetration, allowing it to overcome capillary resistance within the electrode assembly and effectively penetrate the dense areas of the electrode assembly. This not only effectively solves the problem of insufficient wetting of the battery cell electrode assembly and improves the overall performance of the battery cell, but also increases the efficiency of the entire wetting process.

[0007] In some embodiments, the battery injection clamp further includes a second heating device. The other of the first and second clamping portions is provided with the second heating device. The first and second heating devices synchronously heat the first and second clamping portions respectively. Furthermore, the relative position of the second heating device relative to the corresponding sidewall of the battery cell is intermittently changed along a second direction. This embodiment achieves synchronous heating of the two heating devices. Because the second heating device intermittently changes its relative position to the corresponding sidewall of the battery cell along a second direction, it can heat any position of the corresponding sidewall of the battery cell. This allows the two opposing sidewalls of the battery cell to simultaneously receive heat when the battery cell is clamped, thereby reducing the viscosity of the electrolyte and enhancing the fluidity and penetration ability of the electrolyte within the electrode assembly. This more effectively promotes the diffusion and wetting of the electrolyte into the central region of the electrode assembly.

[0008] In some embodiments, the driving device includes a first driving part and a second driving part, both of which are drivenly connected to a first clamping part and a second clamping part. The first driving part is used to drive the first clamping part and the second clamping part to move closer to each other or further away from each other to continuously clamp or release the battery cell. The second driving part is used to drive the first clamping part and the second clamping part to move synchronously relative to the battery cell along a second direction; wherein the second direction is perpendicular to the first direction. Through the cooperative action of the first driving part and the second driving part, the first clamping part and the second clamping part can achieve stable clamping of the battery cell and movement along a specific direction. Furthermore, through the movement of the second driving part, the heating device is no longer limited to a fixed area of ​​the battery cell, but can perform targeted heating of the entire sidewall of the battery cell, ensuring uniform and comprehensive heating.

[0009] In some embodiments, both the first clamping surface and the second clamping surface are planar, and the first heating device and the second heating device are fixedly disposed corresponding to the middle region of the first clamping part and the middle region of the second clamping part, respectively.

[0010] In some embodiments, the first heating device and the second heating device are movably disposed on the first clamping portion and the second clamping portion, respectively; the driving device includes a first driving portion and a third driving portion, the first driving portion being drivenly connected to the first clamping portion and the second clamping portion, and the first driving portion being used to drive the first clamping portion and the second clamping portion to move closer to each other or further away from each other, so as to continuously clamp the battery cell or release the battery cell; the third driving portion is drivenly connected to the first heating device and the second heating device, and the third driving portion being used to drive the first heating device and the second heating device to move synchronously along a second direction; wherein, the second direction is perpendicular to the first direction. This battery electrolyte injection clamp can selectively heat various areas of the electrode assembly inside the battery cell, thereby helping to improve the overall uniformity and efficiency of electrolyte wetting.

[0011] In some embodiments, the first clamping surface is a plane, and the area of ​​the first clamping surface is greater than or equal to the area of ​​the first sidewall, ensuring that the first clamping surface can completely cover the entire first sidewall of the battery cell; and / or, the second clamping surface is a plane, and the area of ​​the second clamping surface is greater than or equal to the area of ​​the second sidewall, ensuring that the second clamping surface can completely cover the second sidewall of the battery cell.

[0012] In some embodiments, the first clamping surface is configured as a curved surface convex toward the second clamping surface, and at least a portion of the first clamping surface intermittently abuts against the corresponding portion of the first sidewall along a second direction. Similarly, the second clamping surface is configured as a curved surface convex toward the first clamping surface, and at least a portion of the second clamping surface intermittently abuts against the corresponding portion of the second sidewall along a second direction. This creates localized pressure concentration on the surface of the battery cell, generating a pressure gradient conducive to electrolyte flow. Through intermittent abutment, the battery cell is dynamically squeezed and released, thereby overcoming the capillary resistance of the electrolyte within the electrode assembly and significantly accelerating the wetting and diffusion of the electrolyte into difficult-to-wet areas. Furthermore, the heating device simultaneously transfers heat to the battery cell, thereby increasing the temperature of the electrolyte inside the battery cell, reducing the electrolyte viscosity to enhance its fluidity and permeability, enabling the electrolyte to overcome the capillary resistance within the electrode assembly and effectively penetrate into the dense areas of the electrode assembly.

[0013] In some embodiments, the driving device includes a first driving part and a second driving part, both of which are drivenly connected to the first clamping part and the second clamping part. The first driving part is used to drive the first clamping part and the second clamping part to move closer to each other or further away from each other. The second driving part is used to drive the first clamping part and the second clamping part to move synchronously relative to the battery cell along a second direction. The first driving part drives the first clamping part and the second clamping part to intermittently abut against corresponding portions of the corresponding sidewalls of the battery cell. The first driving part and the second driving part cooperate to drive the first clamping part and the second clamping part to intermittently abut against the battery cell, aiming to simulate a "breathing" effect and promote the flow and wetting of the electrolyte inside the battery.

[0014] In some embodiments, the driving device includes a first driving part and a third driving part; the first driving part is driven to a first clamping part and a second clamping part, and is used to drive the first clamping part and the second clamping part to move closer to each other or further away from each other, so as to continuously clamp the battery cell or release the battery cell; the third driving part is driven to a first clamping part, and is used to drive the first clamping part to move so that the first clamping surface reciprocates along the first sidewall; and / or, the third driving part is driven to a second clamping part, and is used to drive the second clamping part so that the second clamping surface reciprocates along the second sidewall. In this way, a dynamic, moving local pressure wave is generated in the contact area, which can effectively "push" the electrolyte, allowing the electrolyte to penetrate deeper and be more evenly distributed in the dense and difficult-to-wet areas of the electrode assembly 130.

[0015] In some embodiments, the battery filling clamp further includes a pressure detection unit electrically connected to the drive device. The pressure detection unit includes a pressure sensor, and the first clamping part and / or the second clamping part are provided with pressure sensors. The pressure sensors are used to detect the clamping force on the battery cell. Through the pressure detection unit, when the battery cell is subjected to a breathing clamping motion, the battery filling clamp can sense and precisely control the clamping force in real time.

[0016] In some embodiments, the first clamping surface and / or the second clamping surface are configured as a spherical cap surface formed by rotating a first generatrix around a first guideline; or, the first clamping surface and / or the second clamping surface are configured as an arc surface formed by moving a second generatrix linearly along a second guideline. By selecting a spherical cap surface or an arc surface as the specific shape of the clamping surface, more refined and targeted breathing clamping can be achieved according to the structural characteristics and wetting requirements of the battery cell, thereby significantly improving the wetting effect of the electrolyte.

[0017] In some embodiments, the radius of curvature of the first clamping surface is R1, the length of the first sidewall is L1, and the width is L2, wherein L1 ≥ L2, and 5*L1 ≤ R1 ≤ 10*L1; and / or, the radius of curvature of the second clamping surface is R2, the length of the second sidewall is H1, and the width is H2, wherein H1 ≥ H2, and 5*H1 ≤ R2 ≤ 10*H1. The proportional range of the radii of curvature of the first and second clamping surfaces avoids the risk of excessive curvature leading to an excessively large contact area and reduced breathing effect, or excessive curvature leading to excessively high contact pressure and damage to the battery cells, thereby ensuring both breathing effect and the integrity of the battery cells.

[0018] In some embodiments, the battery filling clamp further includes a temperature sensor. At least one of the first clamping portion and the second clamping portion is provided with a temperature sensor. The temperature sensor is electrically connected to the first heating device and the second heating device, and is used to detect the temperature of the battery cell. By working together with the heating device, the safety of the battery cell can be effectively ensured while heating promotes wettability, preventing damage to the battery cell due to overheating.

[0019] In some embodiments, the battery electrolyte injection fixture further includes an immersion detection structure for detecting the degree to which any area inside a battery cell is wetted by electrolyte; the immersion detection structure is electrically connected to a first heating device and / or a second heating device to achieve linkage between the immersion state and heating control; and / or, the immersion detection structure is electrically connected to a drive device to ensure that the immersion detection structure can transmit the detected data to the drive device in real time or near real time so that the drive device can respond based on the data.

[0020] In some embodiments, the wetting detection structure includes an ultrasonic transmitter, an optical microphone, and a feedback control component. The ultrasonic transmitter and the optical microphone are respectively located on opposite sides of the battery cell. The ultrasonic transmitter emits ultrasonic waves into the battery cell. The feedback control component is electrically connected to the optical microphone and to a first heating device and / or a second heating device. Applying this technical solution, the degree of electrolyte wetting inside the battery cell can be detected in real-time or near real-time, and difficult-to-wet areas can be identified. This aims to achieve linkage between the wetting state and heating control, thereby significantly promoting the penetration and diffusion of the electrolyte in these areas and ensuring sufficient and uniform wetting of the electrolyte inside the battery cell.

[0021] According to a second aspect of the embodiments of this application, a battery production line is provided. The battery production line includes the battery electrolyte injection fixture as described above. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments. 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 of the structure of a battery cell for which the battery liquid injection clamp is designed according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the exploded battery cell is shown.

[0025] Figure 3 This is a schematic diagram of the structure of a first type of battery liquid injection clamp according to an embodiment of this application;

[0026] Figure 4 for Figure 3 The diagram shows the structure of the battery liquid injection clamp, where arrow S1 indicates the direction of movement of the first clamping part and the second clamping part relative to the battery cell.

[0027] Figure 5 This is a schematic diagram of the structure of a second type of battery liquid injection clamp according to an embodiment of this application, wherein arrow S2 in the figure indicates the moving direction of the first heating device and the second heating device relative to the battery cell;

[0028] Figure 6 This is a schematic diagram of the structure of a third type of battery liquid injection clamp according to an embodiment of this application, wherein arrow S3 in the figure indicates the moving direction of the first clamping part and the second clamping part relative to the battery cell;

[0029] Figure 7 This is a schematic diagram of the structure of a fourth type of battery liquid injection clamp according to an embodiment of this application, wherein arrow S4 in the figure indicates the moving direction of the first clamping part and the second clamping part relative to the battery cell;

[0030] Figure 8 This is a schematic diagram of the structure of a fifth type of battery liquid injection clamp according to an embodiment of this application, wherein arrow S5 in the figure indicates the reciprocating rolling direction of the first clamping part along the first side wall and the second clamping part along the second side wall;

[0031] Figure 9 This is a perspective view of one embodiment of the battery filling clamp's first clamping surface of the first clamping part and the second clamping surface of the second clamping part, according to an embodiment of this application.

[0032] Figure 10 for Figure 9The first clamping part / second clamping part shown is a side view along the S6 / S7 direction;

[0033] Figure 11 for Figure 9 Cross-sectional view along the AA direction;

[0034] Figure 12 This is a perspective view of another embodiment of the first clamping part / second clamping part of the battery filling clamp according to an embodiment of this application;

[0035] Figure 13 for Figure 12 A side view of the first clamping part / second clamping part along the S8 direction is shown;

[0036] Figure 14 for Figure 12 The first clamping part / second clamping part shown is a side view schematic diagram along the S9 direction.

[0037] The figures in the diagram are labeled as follows:

[0038] 100. Battery cell; 101. First sidewall; 102. Second sidewall; 110. Casing body; 120. End cap; 130. Electrode assembly;

[0039] 10. First clamping part; 11. First clamping surface;

[0040] 20. Second clamping part; 21. Second clamping surface;

[0041] 30. Immersion detection structure; 31. Ultrasonic transmitter; 32. Optical microphone; 33. Feedback control component;

[0042] 40. Pressure detection unit; 41. Pressure sensor;

[0043] 51. First heating device; 52. Second heating device;

[0044] 60. Temperature sensor;

[0045] 201. First busbar; 202. First guideline; 203. Second busbar; 204. Second guideline. Detailed Implementation

[0046] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0047] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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.

[0048] Furthermore, the terms "first," "second," etc., 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, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants (battery devices used in these applications are generally referred to as energy storage batteries), but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars (battery devices used in these applications are generally referred to as power batteries). With the continuous expansion of battery device application areas, the market demand is also constantly increasing. Therefore, the increase in market demand necessitates a continuous increase in production capacity, and improving production efficiency is one of the quantifiable indicators for increasing production capacity.

[0051] In the battery immersion process, the problem of insufficient immersion in the central region of the electrode assembly stems from the structural characteristics of the battery cell. The internal space of the casing is mainly occupied by the electrode assembly, and the electrodes of the electrode assembly form a dense structure. As a result, after the electrolyte is injected, it will preferentially diffuse to the gap between the side of the electrode assembly and the inner wall of the casing due to gravity, while the diffusion path to the central region is restricted. This results in uneven distribution of electrolyte, which in turn affects the battery's capacity and cycle stability, among other key performance indicators.

[0052] For example, during the electrolyte injection process of pouch cells or prismatic hard-shell cells, the electrolyte, after being injected into the cell, flows rapidly along the edge of the casing, while the central region of the electrode assembly is wetted slowly. Specifically, after wetting, testing confirms that the electrolyte content in the central region of the electrode assembly is lower than that in the edge region, resulting in uneven impedance distribution within the battery and affecting overall performance consistency. This phenomenon repeatedly occurs in mass production, increasing the complexity of process control.

[0053] If the above problems are not addressed, uneven electrolyte distribution within the battery cell will lead to increased local current density differences, resulting in reduced utilization of active materials and exacerbated side reactions. This, in turn, accelerates battery capacity decay and shortens cycle life. Furthermore, insufficiently wetted areas are prone to localized overheating during charging and discharging, increasing the risk of thermal runaway and severely impacting battery reliability.

[0054] Based on the above considerations, embodiments of this application provide a battery electrolyte injection fixture, which is used in battery production lines to improve production efficiency. The battery electrolyte injection fixture uses a drive device to drive a first clamping part and a second clamping part to stably clamp the battery cell. A first heating device heats one of the clamping parts, transferring heat to the battery cell. Since the first heating device intermittently changes its relative position to the corresponding sidewall of the battery cell along a second direction, it can heat any position on the corresponding sidewall of the battery cell, thus covering the entire sidewall area of ​​the battery cell and increasing the temperature of the electrolyte inside the battery cell. This reduces the viscosity of the electrolyte, enhancing its fluidity and penetration, allowing it to overcome capillary resistance within the electrode assembly and effectively penetrate the dense areas of the electrode assembly. This not only effectively solves the problem of insufficient wetting of the battery cell electrode assembly and improves the overall performance of the battery cell, but also increases the efficiency of the entire wetting process.

[0055] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0056] According to a first aspect of the embodiments of this application, embodiments of this application provide a battery liquid filling clamp. For example... Figures 1 to 8As shown, the battery filling clamp includes a driving device, a first clamping part 10, a second clamping part 20, and a first heating device 51. The driving device is drivenly connected to the first clamping part 10 and the second clamping part 20. The first heating device 51 is provided on one of the first clamping part 10 and the second clamping part 20. The first heating device 51 is used to heat one of the first clamping part 10 and the second clamping part 20. The first clamping part 10 has a first clamping surface 11, and the second clamping part 20 has a second clamping surface 21. The first clamping surface 11 and the second clamping surface 21 are arranged opposite to each other. The battery cell 100 has a first sidewall 101 and a second sidewall 102 along a first direction X. When the first clamping part 10 and the second clamping part 20 clamp the battery cell 100, at least a portion of the first clamping surface 11 abuts against at least a portion of the first sidewall 101, and at least a portion of the second clamping surface 21 abuts against at least a portion of the second sidewall 102. The first heating device 51 intermittently changes its relative position with respect to the corresponding sidewall of the battery cell 100 along the second direction Y. The second direction Y is perpendicular to the first direction X, where the first direction X is the thickness direction of the battery cell 100 and the second direction Y is the length direction of the battery cell 100.

[0057] For ease of understanding, the following explains some key terms in this embodiment:

[0058] A drive device is a mechanism that provides power and controls movement. The function of the drive device is to drive the first clamping part 10 and the second clamping part 20 to move closer to or further away from each other, thereby clamping or releasing the battery cell 100. The drive device can take various forms, such as electric, pneumatic, or hydraulic drive systems.

[0059] The first clamping part 10 and the second clamping part 20 are components for direct contact with the battery cell 100. The first clamping part 10 and the second clamping part 20 are made of materials with sufficient strength and heat resistance to ensure stable support of the battery cell 100 during clamping and heating. The first clamping part 10 and the second clamping part 20 move in coordination via a drive device to effectively clamp the battery cell 100.

[0060] The first clamping surface 11 and the second clamping surface 21 are the surfaces on the first clamping part 10 and the second clamping part 20 that directly contact the battery cell 100. The first clamping surface 11 and the second clamping surface 21 can be designed as flat surfaces to provide a larger contact area, ensuring uniform heat transfer and clamping stability; or, the first clamping surface 11 and the second clamping surface 21 can have a certain texture or coating to increase friction and prevent the battery cell 100 from sliding during clamping.

[0061] The first heating device 51 is a device capable of generating heat and transferring it to the corresponding clamping part. The main function of the first heating device 51 is to heat the temperature of the clamped battery cell 100, thereby reducing the viscosity of the electrolyte inside the battery cell 100 to promote the wetting effect of the electrolyte in the electrode assembly 130. The first heating device 51 can be implemented by resistance heating, induction heating, or hot fluid circulation heating.

[0062] A battery cell 100 refers to a single battery unit that has not yet been assembled into a battery device during the battery manufacturing process. During the electrolyte injection process, the battery cell 100 needs to be fully immersed in the electrolyte to ensure its subsequent electrochemical performance. The battery cell 100 has a first sidewall 101 and a second sidewall 102 along a first direction X. These sidewalls are the main contact areas for clamping and heating by the first clamping portion 10 and the second clamping portion 20.

[0063] "The relative position of the first heating device 51 relative to the corresponding side wall of the battery cell 100 changes intermittently along the second direction Y" means that, taking the first heating device 51 as an example, when the battery cell 100 is clamped by the battery liquid injection clamp, the relative position between the first heating device 51 and the first side wall 101 changes intermittently. For example, the first side wall 101 is divided into several position areas along the second direction Y. During the clamping process, the first heating device 51 is directly opposite to one of the position areas and remains there for a predetermined time. After the predetermined time is reached, the first heating device 51 changes to be directly opposite to another position area and remains there for a predetermined time. This continues until the liquid injection is completed.

[0064] In this battery filling clamp, a drive device is driven and connected to the first clamping part 10 and the second clamping part 20 to control the movement of the first clamping part 10 and the second clamping part 20. For example, the drive device may include a motor, which is connected to the first clamping part 10 and the second clamping part 20 through a gear or lead screw mechanism. When the motor rotates, it can drive the first clamping part 10 and the second clamping part 20 to move closer to or further away from each other, thereby clamping or releasing the battery cell 100. One of the first clamping part 10 and the second clamping part 20 is provided with a first heating device 51. For example, the first heating device 51 may be embedded inside the first clamping part 10 or fixed to the surface of the first clamping part 10. The first heating device 51 may be an electric heating element connected to a power source through a wire to generate heat when energized; or, the first heating device 51 may be a hot fluid circulation system that introduces heated fluid into the first clamping part 10 through pipes to heat the first clamping part 10. Then, through heat conduction, the first clamping part 10 transfers heat to the clamped battery cell 100, raising the temperature of the battery cell 100 and reducing the viscosity of its internal electrolyte, thereby improving the fluidity of the electrolyte and promoting its penetration into the dense area of ​​the electrode assembly 130.

[0065] The following is a more specific exemplary embodiment: A battery cell 100 has just completed the initial injection of electrolyte, but the central region of its internal electrode assembly 130 has not yet been fully wetted by the electrolyte. The battery cell 100 is then transported to the battery injection fixture proposed in this application for immersion. First, the driving device drives the first clamping part 10 and the second clamping part 20 away from each other, providing space for the battery cell 100 to enter. The battery cell 100 is placed between the first clamping part 10 and the second clamping part 20, with its first sidewall 101 and second sidewall 102 facing the first clamping surface 11 and the second clamping surface 21, respectively. Subsequently, the driving device receives a clamping command and begins to drive the first clamping part 10 and the second clamping part 20 closer together. The first clamping surface 11 gradually abuts against the first sidewall 101 of the battery cell 100, while the second clamping surface 21 abuts against the second sidewall 102 of the battery cell 100. When the clamping force reaches a preset value, the drive device stops driving or maintains a stable holding torque, and the battery cell 100 is stably clamped between the two clamping parts. After the battery cell 100 is stably clamped, the first heating device 51 is activated. Taking the first heating device 51 being installed on the first clamping part 10 as an example, the first heating device 51 heats the first clamping part 10, raising its temperature and transferring the heat to the first sidewall 101 of the battery cell 100 through the first clamping surface 11. Then, the heat is gradually transferred through the shell body 110 of the battery cell 100 to the electrolyte and electrode assembly 130 inside the battery cell 100. As the electrolyte temperature rises, its viscosity gradually decreases. The decrease in viscosity enhances the fluidity of the electrolyte, making it easier to penetrate into the relatively dense areas of the electrode assembly 130, especially the central area that is difficult to wet during the initial electrolyte injection process. Furthermore, since the first heating device 51 intermittently changes its relative position to the first sidewall 101 of the battery cell 100 along the second direction Y, the first heating device 51 can heat any position of the first sidewall 101 of the battery cell 100. This allows the heating device to cover the entire sidewall area of ​​the first sidewall 101 of the battery cell 100. Thus, the heating device is no longer limited to a fixed area of ​​the first sidewall 101 of the battery cell 100, but can selectively heat the entire sidewall, ensuring uniform and comprehensive heating. The continuous heat transfer allows the electrolyte to diffuse more quickly and evenly, thereby promoting the full wetting of the electrode assembly 130 inside the battery cell 100. When the wetting reaches the preset conditions, i.e., the electrolyte has fully wetted the electrode assembly 130, the driving device again drives the first clamping part 10 and the second clamping part 20 to move away from each other, releasing the fully wetted battery cell 100.

[0066] The battery electrolyte injection fixture provided in this application uses a driving device to drive the first clamping part 10 and the second clamping part 20 to stably clamp the battery cell 100. A first heating device 51 heats one of the clamping parts, thereby transferring heat to the battery cell 100. Since the first heating device 51 intermittently changes its relative position to the corresponding sidewall of the battery cell 100 along the second direction Y, it can heat any position on the corresponding sidewall of the battery cell 100. This allows the heating device to cover the entire sidewall area of ​​the battery cell 100, rapidly increasing the temperature of the electrolyte inside the battery cell 100. This significantly reduces the viscosity of the electrolyte, enhancing its fluidity and penetration. Due to the increased fluidity of the electrolyte, it can overcome the capillary resistance inside the electrode assembly 130, effectively penetrating the dense area of ​​the electrode assembly 130, particularly the central region. In this way, not only can the problem of insufficient wetting of the electrode assembly 130 of the battery cell 100 be effectively solved and the overall performance of the battery cell 100 be improved, but the efficiency of the entire wetting process can also be significantly improved.

[0067] like Figures 3 to 8 As shown, in some embodiments of this application, the battery filling clamp further includes a second heating device 52. The other of the first clamping portion 10 and the second clamping portion 20 is provided with a second heating device 52. The first heating device 51 and the second heating device 52 synchronously heat the first clamping portion 10 and the second clamping portion 20 respectively. Furthermore, the relative position of the second heating device 52 with respect to the corresponding sidewall of the battery cell 100 is intermittently changed along the second direction Y. The second heating device 52 is a device capable of generating heat and transferring it to the object being heated. The second heating device 52 works in conjunction with the first heating device 51 to heat the battery cell 100. The second heating device 52 can be a resistance wire heater, generating Joule heating through current and then transferring heat to the second clamping portion 20 through heat conduction; alternatively, the second heating device 52 can also be a PTC heater, whose resistance increases with temperature, possessing automatic temperature control characteristics and providing stable and safe heating; or, the second heating device 52 can also be a hot air heater, blowing hot air towards the second clamping portion 20 through forced convection to achieve rapid heating. A first heating device 51 can be disposed on a first clamping part 10, and a second heating device 52 can be disposed on a second clamping part 20. The first heating device 51 and the second heating device 52 synchronously heat the first clamping part 10 and the second clamping part 20 respectively. "Synchronous" means that the start-up, stop and heating power adjustment of the two heating devices are coordinated to ensure that the two sides of the battery cell 100 are heated evenly.

[0068] When the battery cell 100 is clamped by the first clamping part 10 and the second clamping part 20, the first clamping surface 11 abuts against the first side wall 101 of the battery cell 100, and the second clamping surface 21 abuts against the second side wall 102 of the battery cell 100. At this time, the first heating device 51 heats the first clamping part 10, and the second heating device 52 heats the second clamping part 20. The first heating device 51 and the second heating device 52 can heat both sides simultaneously. Furthermore, while the first heating device 51 intermittently changes its relative position with respect to the corresponding side wall of the battery cell 100 along the second direction Y, the second heating device 52 also intermittently changes its relative position with respect to the corresponding side wall of the battery cell 100 along the second direction Y, further ensuring the uniformity and comprehensiveness of heating, so that both sides of the battery cell 100 can simultaneously and uniformly obtain heat. Heat is transferred from the two clamping parts to the two side walls of the battery cell 100, thereby effectively increasing the overall temperature of the battery cell 100. This, in turn, raises the temperature of the electrolyte, which helps to reduce the viscosity of the electrolyte, increase its fluidity, and accelerate the capillary action and diffusion rate of the electrolyte inside the electrode assembly 130. This promotes the penetration of the electrolyte into the central region of the electrode assembly 130, allowing the electrolyte to fully wet the electrode assembly 130.

[0069] As an example, both the first clamping part 10 and the second clamping part 20 are made of materials with good thermal conductivity, such as aluminum alloy or copper, to ensure that heat can be efficiently transferred from the heating device to the clamping surface. The first heating device 51 and the second heating device 52 can respectively adopt thin-film heaters or ceramic heating elements. These heating elements have the advantages of small size, fast heating speed, and precise temperature control. Furthermore, the thin-film heaters can be directly attached to or embedded inside the first clamping part 10 and the second clamping part 20, close to the first clamping surface 11 and the second clamping surface 21. To achieve synchronous heating, a main control unit, such as a programmable logic controller (PLC), can be set up. When the battery cell 100 is clamped, the PLC can instruct the two heating devices to start heating simultaneously at a preset power, thereby realizing that the first heating device 51 and the second heating device 52 synchronously heat the first clamping part 10 and the second clamping part 20 respectively.

[0070] In this embodiment, the battery electrolyte injection clamp is equipped with heating devices in both the first clamping part 10 and the second clamping part 20, and the two heating devices are heated synchronously. This allows the two opposite sidewalls of the battery cell 100 to receive heat simultaneously when the battery cell 100 is clamped. The temperature field reduces the viscosity of the electrolyte and enhances the fluidity and penetration ability of the electrolyte inside the electrode assembly 130. This can more effectively promote the diffusion and wetting of the electrolyte into the central region of the electrode assembly 130, and significantly improve the wetting uniformity and efficiency of the battery cell.

[0071] like Figure 4As shown, in some embodiments of this application, the driving device includes a first driving part and a second driving part. Both the first driving part and the second driving part are drivenly connected to the first clamping part 10 and the second clamping part 20. The first driving part is used to drive the first clamping part 10 and the second clamping part 20 to move closer to each other or further away from each other to continuously clamp the battery cell 100 or release the battery cell 100. The second driving part is used to drive the first clamping part 10 and the second clamping part 20 to move synchronously relative to the battery cell 100 along the second direction Y, so that the first heating device 51 and the second heating device 52 can correspond to any position of the battery cell 100. The second direction Y is perpendicular to the first direction X. Wherein, the second direction Y is the length direction of the battery cell 100, and the second direction Y is also the closing direction of the end cap 120 of the battery cell 100 to the shell body 110. The corresponding third direction Z is the width direction of the battery cell 100. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first driving unit is a key component that drives the first clamping unit 10 and the second clamping unit 20 to clamp or release the battery cell 100. The function of the first driving unit is to provide precise and stable clamping force, ensuring stable clamping of the battery cell 100, and enabling rapid release when needed. The first driving unit can be implemented in various ways. For example, it can be driven by a pneumatic or hydraulic cylinder, using the extension and retraction of a piston rod to move the clamping unit; or it can use a servo motor in conjunction with a lead screw or ball screw mechanism, converting the rotational motion of the motor into the linear reciprocating motion of the clamping unit. The second driving unit is the core component that enables the heating device to move on the surface of the battery cell 100. The function of the second driving unit is to drive the first clamping unit 10 and the second clamping unit 20 to move synchronously relative to the battery cell 100 in a specific direction, thereby causing the heating device attached to the clamping unit to move accordingly. The first heating device 51 and the second heating device 52 can heat any position of the battery cell 100, allowing the heating device to cover the entire sidewall area of ​​the battery cell 100. The second drive unit can be directly driven by a linear motor to achieve high-precision and high-speed linear motion; alternatively, a servo motor can be used in conjunction with a gear and rack or synchronous belt transmission mechanism to convert the rotational motion of the motor into linear movement of the clamping unit. Through the coordinated action of the first and second drive units, the first clamping unit 10 and the second clamping unit 20 can achieve stable clamping of the battery cell 100 and movement along a specific direction. Furthermore, through the movement of the second drive unit, the heating device is no longer limited to a fixed area of ​​the battery cell 100, but can perform targeted heating of the entire side wall of the battery cell 100, ensuring uniform and comprehensive heating.

[0072] As an example, the first drive unit can consist of a pair of pneumatic grippers driven by a cylinder to quickly clamp and release the battery cell 100. The second drive unit can consist of a slider mounted on a precision linear guide rail, which reciprocates via a ball screw mechanism driven by a servo motor. The first clamping part 10 and the second clamping part 20 are fixed to the slider and respectively embedded with heating elements as the first heating device 51 and the second heating device 52. After the battery cell 100 is stably clamped by the first clamping part 10 and the second clamping part 20, the servo motor is started, driving the entire clamping assembly to move at a constant or variable speed along the second direction Y in the length direction of the battery cell 100. During this process, the heating elements continuously heat the two side walls of the battery cell 100 to ensure that all areas of the battery cell 100 are heated to the preset temperature. The second driving unit in the driving device of this embodiment enables the first heating device 51 and the second heating device 52 to move synchronously relative to the battery cell 100 along its length direction, thereby achieving comprehensive and uniform heating of the entire sidewall of the battery cell 100, promoting the diffusion and wetting of the electrolyte inside the electrode assembly 130 of the battery cell 100, helping to improve the wetting efficiency and wetting uniformity of the battery cell 100, thereby improving the overall performance and service life of the battery.

[0073] In some embodiments of this application, both the first clamping surface 11 and the second clamping surface 21 are planar, and the first heating device 51 and the second heating device 52 are fixedly disposed corresponding to the middle region of the first clamping part 10 and the middle region of the second clamping part 20, respectively. In this embodiment, the first heating device 51 and the second heating device 52 are fixedly disposed corresponding to the middle region of the first clamping part 10 and the middle region of the second clamping part 20, respectively, in order to concentrate the heat source in the middle region of the clamping part. This allows the heating energy to be preferentially and efficiently transferred to the corresponding sidewall of the battery cell 100, thereby allowing the heat to act on the difficult-to-wet area of ​​the electrode assembly 130 inside the battery cell 100, thereby effectively promoting the diffusion and wetting of the electrolyte in that area.

[0074] As an example, the first clamping surface 11 and the second clamping surface 21 can be made of aluminum alloy plates with finely ground and polished surfaces to ensure their flatness and thermal conductivity. The first heating device 51 and the second heating device 52 can be flexible silicone heating sheets, the shape and size of which are designed to cover the central area of ​​the first clamping part 10 and the second clamping part 20. When the first heating device 51 intermittently changes its relative position with respect to the corresponding sidewall of the battery cell 100 along the second direction Y, and the second heating device 52 also intermittently changes its relative position with respect to the corresponding sidewall of the battery cell 100 along the second direction Y, the entire sidewall of the battery cell 100 can be targeted for heating, ensuring uniform and comprehensive heating.

[0075] In some embodiments of the battery filling clamp of this application, the battery filling clamp has the first heating device 51 and the second heating device 52 respectively movably disposed in the first clamping part 10 and the second clamping part 20, such as... Figure 5As shown, the driving device includes a first driving unit and a third driving unit. The first driving unit is driven to the first clamping unit 10 and the second clamping unit 20. The first driving unit is used to drive the first clamping unit 10 and the second clamping unit 20 to move closer to each other or further away from each other, so as to continuously clamp the battery cell 100 or release the battery cell 100. When clamping the battery cell 100, the first heating device 51 is directly opposite the middle region of the first sidewall 101, and the second heating device 52 is directly opposite the middle region of the second sidewall 102. The third driving unit is driven to the first heating device 51 and the second heating device 52. During the heating of the battery cell 100, the third driving unit is used to drive the first heating device 51 and the second heating device 52 to move synchronously along the second direction Y, so that the first heating device 51 and the second heating device 52 can correspond to any position of the battery cell 100. Wherein, the second direction Y is perpendicular to the first direction X. Specifically, in this embodiment, the first heating device 51 and the second heating device 52 are no longer fixed on the clamping unit, but can be adjusted in position inside or on the surface of the clamping unit. For example, the heating devices (first heating device 51 and second heating device 52) can be mounted on slide rails inside the corresponding clamping parts, and driven to move along the length of the clamping parts by linear actuators (such as lead screws, racks and pinions, or cylinders); or, the heating devices can be integrated into a movable heating plate, which is connected to the clamping parts by magnetic adsorption or mechanical snap-fit, and moved by an external drive mechanism. The drive mechanism is subdivided into two functionally independent drive units, namely the first drive unit and the third drive unit, each responsible for different motion control. For example, the first driving unit can be a pneumatic gripper or an electric gripper, and the third driving unit can be a stepper motor or a servo motor in conjunction with a transmission mechanism to drive the first clamping part 10 and the second clamping part 20 to move closer to each other or further away from each other, so as to continuously clamp or release the battery cell 100, ensuring the stable fixation of the battery cell during heating and immersion. Alternatively, the first driving unit can be a bidirectional cylinder, which controls the air pressure to open and close the clamping part. Or, the first driving unit can be a servo motor-driven lead screw mechanism, which drives the clamping part to perform precise reciprocating motion by rotating the lead screw. When clamping the battery cell 100, the first heating device 51 is directly opposite the middle area of ​​the first side wall 101, and the second heating device 52 is directly opposite the middle area of ​​the second side wall 102. This is the initial positioning state of the heating device, which aims to prioritize the immersion effect in the middle area of ​​the battery cell 100. The third driving unit is used to realize the dynamic positioning of the heating device, which allows the heating area to be scanned or fixed-point heated along the length direction (second direction Y) of the battery cell.For example, the third drive unit can consist of a synchronous belt or rack and pinion system driven by a stepper motor or servo motor, which drives the two heating devices to move synchronously on their respective clamping parts; or, the third drive unit can use two independent linear motors to drive the first heating device 51 and the second heating device 52 respectively, and ensure their synchronous movement through a control system.

[0076] This embodiment operates as follows: First, the battery cell 100 is placed between the first clamping part 10 and the second clamping part 20. Then, the first driving part is activated, driving the first clamping part 10 and the second clamping part 20 to move closer together, thereby stably clamping the battery cell 100. At this time, the first clamping surface 11 (plane) abuts against the first sidewall 101 of the battery cell 100, and the second clamping surface 21 (plane) abuts against the second sidewall 102 of the battery cell 100, ensuring sufficient contact area. After clamping, the first heating device 51 and the second heating device 52 are initially positioned in the middle region of the first sidewall 101 and the second sidewall 102 of the battery cell 100, respectively, and begin synchronous heating to promote the wetting effect of the electrolyte in the middle region of the battery cell 100. Furthermore, in order to solve the problem of immersion in areas outside the center, the third drive unit is activated. The third drive unit is driven to connect with the first heating device 51 and the second heating device 52, and drives the two heating devices to move synchronously along the second direction Y (perpendicular to the battery thickness direction X, i.e. the length direction of the battery cell 100), so that the heating area can be scanned or heated at a fixed point along the length direction of the battery cell 100.

[0077] In this way, the battery electrolyte injection fixture can target and heat various areas of the electrode assembly 130 inside the battery cell 100, especially those areas that are difficult to wet (e.g., targeted local heating of difficult-to-wet areas in the electrode assembly 130, such as edges or corners), thereby helping to improve the overall uniformity and efficiency of electrolyte wetting.

[0078] In some embodiments of this application, the first clamping surface 11 is a plane, and the area of ​​the first clamping surface 11 is greater than or equal to the area of ​​the first sidewall 101; and / or, the second clamping surface 21 is a plane, and the area of ​​the second clamping surface 21 is greater than or equal to the area of ​​the second sidewall 102. The first clamping surface 11 is set as a plane to ensure that a stable and uniform contact is formed between the first clamping surface 11 and the first sidewall 101 of the battery cell 100, thereby facilitating the uniform transfer of heat from the first clamping surface 11 to the first sidewall 101 and avoiding localized overheating or insufficient heating due to uneven contact. Of course, in addition to a completely flat surface, a plane can also be a surface with microscopic roughness but macroscopically flat characteristics, such as a finely ground or polished metal plate, ceramic plate, or polymer material plate. Since the area of ​​the first clamping surface 11 is designed to be greater than or equal to the area of ​​the first sidewall 101 of the battery cell 100, it is ensured that the first clamping surface 11 can completely cover the entire first sidewall 101 of the battery cell 100. Similarly, the second clamping surface 21 is also set as a plane, which can make uniform and stable contact with the second side wall 102 of the battery cell 100 to achieve symmetrical heating on both sides of the battery cell 100. In addition, the area of ​​the second clamping surface 21 is designed to be greater than or equal to the area of ​​the second side wall 102 of the battery cell 100, thus ensuring that the second clamping surface 21 can completely cover the second side wall 102 of the battery cell 100.

[0079] In the aforementioned battery electrolyte injection fixture, both the first clamping surface 11 and the second clamping surface 21 are set as planes, and their areas are ensured to be greater than or equal to the areas of the first sidewall 101 and the second sidewall 102 of the battery cell 100, respectively. When the driving device clamps the battery cell 100 with the first clamping part 10 and the second clamping part 20, the planar first clamping surface 11 can achieve full and stable contact with the first sidewall 101 of the battery cell 100, and the planar second clamping surface 21 can achieve full and stable contact with the second sidewall 102 of the battery cell 100. Since the clamping surface area is large enough to completely cover the entire sidewall of the battery cell 100, the heat generated by the first heating device 51 and the second heating device 52 can be evenly transferred to the entire first sidewall 101 and the second sidewall 102 of the battery cell 100 through the flat contact surface, thereby ensuring that the battery cell 100 is heated evenly during the heating process and effectively promoting the wetting effect of the electrolyte inside the battery cell 100. Furthermore, by setting the clamping surface area to be greater than or equal to the side wall area of ​​the battery cell, the clamp can be compatible with battery cells of different sizes, thus improving the versatility of the device.

[0080] The following description uses an exemplary embodiment. The first clamping part 10 and the second clamping part 20 can be made of metal plates, such as aluminum alloy or stainless steel. The surfaces of the first clamping part 10 and the second clamping part 20 that contact the battery cell 100 are precision machined to ensure that the first clamping surface 11 and the second clamping surface 21 are highly flat. For example, the required flatness can be obtained by CNC milling or grinding. The size of the first clamping surface 11 can be designed to be slightly larger than the maximum possible size of the first sidewall 101 of the battery cell 100 to be clamped. For example, if the first sidewall 101 of the battery cell 100 is typically 100mm x 80mm, then the first clamping surface 11 can be designed as a 105mm x 85mm plane. Similarly, the size of the second clamping surface 21 can also adopt the same design principle.

[0081] By employing the aforementioned technical solution, the first clamping surface 11 and the second clamping surface 21 are designed as planes, with their areas being greater than or equal to the areas of the first sidewall 101 and the second sidewall 102 of the battery cell 100. This ensures that the contact area between the first clamping surface 11 and the second clamping surface 21 and the battery cell 100 is sufficient and uniform during clamping and heating. Furthermore, the planar clamping surfaces guarantee that heat can be uniformly transferred from the first heating device 51 and the second heating device 52 to the entire sidewall of the battery cell 100, avoiding localized overheating or underheating, thereby significantly improving the wetting efficiency and uniformity of the electrolyte within the battery cell 100. Simultaneously, by designing the clamping surface area to be greater than or equal to the sidewall area of ​​the battery cell, the fixture can accommodate battery cells of different sizes, improving the versatility of the equipment and the flexibility of the production line.

[0082] like Figures 6 to 8As shown, in some embodiments of this application, the first clamping surface 11 is configured as a curved surface protruding toward the second clamping surface 21. At least a portion of the first clamping surface 11 intermittently abuts against the corresponding portion of the first sidewall 101 along the second direction Y to achieve a breathing-like clamping process for the battery cell 100. Specifically, the first clamping surface 11 is configured as a curved surface, which refers to a surface with continuous bending characteristics in three-dimensional space, rather than a plane. "Protruding" means that when in contact with the battery cell 100, the central region or a specific portion of the curved surface is closer to the battery cell 100 than the edge region of the curved surface, thereby forming a local concentrated force point (or local concentrated force area) upon contact. The function of this curved surface is that when the first clamping surface 11 abuts against the first sidewall 101 of the battery cell 100, it can generate a non-uniform pressure distribution, forming a local high-pressure area, thereby inducing a pressure gradient inside the battery cell 100. The intermittent contact between at least a portion of the first clamping surface 11 and the corresponding portion of the first sidewall 101 along the second direction Y means that the contact pressure between the first clamping surface 11 and the first sidewall 101 of the battery cell 100 varies along the second direction Y and periodically switches between application and release. Applying pressure to different areas of the battery cell 100 at different times is a dynamic squeezing and releasing process, thus achieving a "breathing-like" clamping process for the battery cell 100. This "breathing-like" clamping process is a dynamic clamping process whose core lies in simulating the respiratory movement of a living organism through periodic, rhythmic changes in clamping force, causing the battery cell 100 to undergo minute deformation and recovery in the thickness direction X. Furthermore, during the breathing-like clamping process, heating further enhances the wetting and diffusion capabilities of the electrolyte, making the pressure gradient and dynamic squeezing effects more significant, thereby promoting the flow and wetting of the electrolyte inside the electrode assembly 130.

[0083] As an exemplary embodiment, the first clamping surface 11 can be machined into an arc surface with a specific radius of curvature, with its highest protrusion located in the central region of the first clamping surface 11. The driving device may include a lead screw mechanism controlled by a servo motor, which, through precise programming, periodically drives the first clamping part 10 and the second clamping part 20 to perform minute reciprocating movements. For example, a clamping cycle can be set: the driving device clamps the battery cell 100 with a preset clamping force using the first clamping part 10 and the second clamping part 20, and holds this state for several seconds; then, the driving device slightly relaxes the clamping force, reducing the clamping force to a lower level, and holds it for several seconds; after that, the driving device applies the preset clamping force again. This cycle is repeated to achieve intermittent contact with the battery cell 100. Furthermore, the first heating device 51 and the second heating device 52 can be electric heating elements, with the heating temperature precisely controlled by a PID controller to ensure that the battery cell 100 is always within a suitable temperature range conducive to electrolyte wetting throughout the entire breathing clamping process.

[0084] Through the above technical solution, the first clamping part 10 of the battery injection clamp in this embodiment, through its convex curved surface design, forms a local pressure concentration on the surface of the battery cell 100, generating a pressure gradient conducive to electrolyte flow. By intermittent contact, it simulates a "breathing" effect, dynamically squeezing and releasing the battery cell 100, thereby overcoming the capillary resistance of the electrolyte inside the electrode assembly 130 and significantly accelerating the wetting and diffusion of the electrolyte into difficult-to-wet areas. Furthermore, combined with synchronous heating, it reduces the electrolyte viscosity and enhances the electrolyte's fluidity, making the breathing clamping effect even more significant and achieving uniform and sufficient wetting of the electrode assembly 130 inside the battery cell 100.

[0085] like Figures 6 to 8 As shown, in some embodiments of this application, the second clamping surface 21 is configured as a curved surface protruding toward the first clamping surface 11, and at least a portion of the second clamping surface 21 intermittently abuts against the corresponding portion of the second sidewall 102 along the second direction Y to achieve a breathing clamping process for the battery cell 100.

[0086] The second clamping surface 21 is configured as a curved surface convex towards the first clamping surface 11, meaning that the geometry of the second clamping surface 21 is also an outwardly convex surface. This curved surface design aims to form a non-planar contact with the second sidewall 102 of the battery cell 100, thereby generating local stress concentration or intermittent contact areas during clamping. For example, the second clamping surface 21 can be designed as a spherical cap surface formed by rotating the first generatrix 201 around the first guideline 202, such as... Figures 9 to 11 As shown, its center point or highest point faces the first clamping surface 11. When clamping the battery cell 100, the vertex of the spherical cap surface or its vicinity will first or mainly contact the second sidewall 102 of the battery cell 100; or, the second clamping surface 21 can also be designed as a cylindrical or elliptical cylindrical arc surface, the arc direction of which is parallel or perpendicular to the length or width direction of the battery cell 100 and protrudes towards the first clamping surface 11. This arc surface can form a line contact with the second sidewall 102 of the battery cell 100 when clamped.

[0087] At least a portion of the second clamping surface 21 intermittently abuts against the corresponding portion of the second sidewall 102 along the second direction Y. This is one of the keys to achieving "breathing clamping" of the battery cell 100. The second clamping surface 21 applies and releases pressure to the second sidewall 102 periodically by changing its position along the second direction Y, while the first clamping surface 11 simultaneously applies and releases pressure to the first sidewall 101 periodically by changing its position along the second direction Y. This causes the electrolyte inside the battery cell 100 to flow and permeate between the electrodes, thereby further improving the wetting efficiency. For example, the driving device can control the second clamping part 20 to periodically move its second clamping surface 21 closer to and further away from the second sidewall 102 of the battery cell 100 at a preset frequency and amplitude, thereby achieving intermittent abutment.

[0088] The solution of this application sets the second clamping surface 21 as a curved surface protruding toward the first clamping surface 11, so that at least a portion of the second sidewall 102 is intermittently abutted by the corresponding portion of the second clamping surface 21, thereby achieving a double-sided breathing clamping of the battery cell 100 on both sidewalls. Specifically, when the driving device drives the first clamping part 10 and the second clamping part 20 to clamp the battery cell 100, the first clamping surface 11 (set as a curved surface protruding toward the second clamping surface 21) corresponds to the first sidewall 101 of the battery cell 100, and the second clamping surface 21 (also set as a curved surface protruding toward the first clamping surface 11) corresponds to the second sidewall 102 of the battery cell 100. Since both the first clamping surface 11 and the second clamping surface 21 are convex curved surfaces, the contact between the first clamping surface 11 and the second clamping surface 21 and the two side walls (first side wall 101 and second side wall 102) of the battery cell 100 is localized rather than completely planar. This localized contact causes the pressure to concentrate on the convex portion of the curved surface during clamping. During the breathing clamping process, the drive device controls the first clamping part 10 and the second clamping part 20 to move intermittently or apply intermittent clamping force. Thus, the first clamping surface 11 intermittently abuts against at least a portion of the first side wall 101, and at the same time, the second clamping surface 21 intermittently abuts against at least a portion of the second side wall 102. This bilateral, localized, intermittent abutment causes a certain location area of ​​the battery cell 100 to be subjected to periodic, non-uniform compression and release in the first direction X within a predetermined time. When clamping force is applied, the battery cell 100 is locally compressed, and the internal electrolyte permeates into the uncompressed areas under pressure. When the clamping force decreases or is released, the battery cell 100 recovers, forming a slight negative pressure, further drawing in electrolyte. By simultaneously performing this breathing-type clamping on both sides of the battery cell 100, and combining it with synchronous heating, the electrolyte viscosity is reduced, and the electrolyte flowability is enhanced. This makes the breathing-type clamping effect more significant, promoting the fluidity of the electrolyte within the battery cell 100 more uniformly and efficiently to enhance the wetting effect, especially in the central area of ​​the electrode assembly 130 or areas that are difficult to wet.

[0089] like Figure 6As shown, in some embodiments of this application, the driving device includes a first driving part and a second driving part. Both the first driving part and the second driving part are drivenly connected to the first clamping part 10 and the second clamping part 20. The first driving part is used to drive the first clamping part 10 and the second clamping part 20 to move closer to each other or further away from each other. The second driving part is used to drive the first clamping part 10 and the second clamping part 20 to move synchronously relative to the battery cell 100 along the second direction Y. Specifically, the first driving part drives the first clamping part 10 and the second clamping part 20 to intermittently abut against the battery cell 100. Specifically, the driving device is a mechanism that provides power and controls movement. The first driving part and the second driving part are both core components of the driving device, responsible for generating and transmitting mechanical force to realize the movement of the clamping part. The first and second drive units can be a hydraulic drive system, providing power through hydraulic cylinders and hydraulic pumps to achieve precise force and displacement control; alternatively, the first drive unit can be a pneumatic drive system, utilizing cylinders and air sources to provide power, offering fast response and a simple structure; still others, the first and second drive units can be an electric drive system, using servo motors or stepper motors in conjunction with transmission mechanisms such as lead screws and racks to achieve high-precision, programmable motion control. The power generated by the first drive unit can be effectively transmitted to the two clamping parts, thereby controlling their relative movement. The first drive unit can be driven by mechanical transmission methods such as linkage mechanisms, rack and pinion mechanisms, or lead screw and nut mechanisms, or by connecting hydraulic cylinders or air cylinders to the clamping parts through hydraulic or pneumatic pipelines to achieve fluid drive. The first driving unit drives the first clamping unit 10 and the second clamping unit 20 to intermittently contact the battery cell 100. This means that the clamping units periodically clamp and release the battery cell 100, aiming to simulate a "breathing" effect and promote the flow and wetting of electrolyte inside the battery. Furthermore, after the clamping units have held the battery cell 100 at a certain location for a predetermined time, the second driving unit drives the clamping units to move along a second direction to the next location, and then the first driving unit drives the clamping units to intermittently contact that location. This process continues until electrolyte filling is complete.

[0090] As an exemplary embodiment, the first driving unit can be a lead screw mechanism driven by a servo motor. The servo motor drives the lead screw to rotate by precisely controlling its speed and angle. The lead screw is then connected to the linkage mechanism of the first clamping part 10 and the second clamping part 20 via a nut. The servo motor is programmed to rotate forward and backward according to preset periodic commands, thereby enabling the first clamping part 10 and the second clamping part 20 to move closer and further apart. For example, a clamping cycle can be set, including a clamping phase and a releasing phase. In the clamping phase, the servo motor drives the clamping part to approach at a preset speed. When a preset clamping force or position is reached, it is held for a period of time, causing localized compression of the battery cell 100. In the releasing phase, the servo motor drives the clamping part to move away at a preset speed, releasing at least some of the pressure. This is held for a period of time, and then the clamping phase is entered again. This cycle repeats continuously, allowing the battery cell 100 to continuously "breathe" under heating and curved surface contact conditions, promoting uniform electrolyte wetting of the electrode assembly 130. Similarly, the second drive unit can be a lead screw mechanism driven by a servo motor. The servo motor drives the lead screw to rotate by precisely controlling the speed and angle. The lead screw is then connected to the linkage mechanism of the first clamping part 10 and the second clamping part 20 through a nut. By programming and controlling the servo motor, it can rotate forward and backward according to preset periodic instructions, thereby realizing the synchronous movement of the first clamping part 10 and the second clamping part 20 along the second direction Y, so that the heating device moves to the next position area of ​​the battery cell 100 for intermittent contact.

[0091] like Figure 7 As shown, in some embodiments of this application, based on the first clamping surface 11 being configured as a curved surface protruding towards the second clamping surface 21 and the second clamping surface 21 being configured as a curved surface protruding towards the first clamping surface 11, the driving device includes a first driving part and a second driving part. The first driving part and the second driving part are both drivenly connected to the first clamping part 10 and the second clamping part 20. The first driving part is used to drive the first clamping part 10 and the second clamping part 20 to move closer to each other or move further away from each other to continuously clamp the battery cell 100 or release the battery cell 100. The second driving part is used to drive the first clamping part 10 and the second clamping part 20 to move synchronously relative to the battery cell 100 along the second direction Y, so that the first heating device 51 and the second heating device 52 can correspond to any position of the battery cell 100, that is, the first clamping part 10 and the second clamping part 20 cooperate to achieve intermittent contact (breathing clamping) at different positions of the first sidewall 101 and the second sidewall 102 of the battery cell 100. During the breathing clamping process, heating further enhances the wetting and diffusion capabilities of the electrolyte, making the effects of pressure gradient and dynamic extrusion more significant, thereby promoting the flow and wetting of the electrolyte inside the electrode assembly 130.

[0092] like Figure 8As shown, in some embodiments of this application, the driving device of the battery filling clamp includes a first driving unit and a third driving unit. Both the first and third driving units are drivably connected to the first clamping unit 10 and the second clamping unit 20. The first driving unit drives the first clamping unit 10 and the second clamping unit 20 to move closer to or further away from each other, to continuously clamp or release the battery cell 100. The third driving unit drives the first clamping unit 10 to move so that the first clamping surface 11 reciprocates along the first sidewall 101; and / or, the third driving unit drives the second clamping unit 20 to make the second clamping surface 21 reciprocate along the second sidewall 102. The driving device is a mechanism for providing mechanical power to realize the movement of the various components of the clamp. The first and third driving units are sub-units with specific functions in the driving device. The first driving unit is mainly responsible for the clamping action, while the third driving unit focuses on realizing the rolling of the clamping surface. This allows the clamping and rolling actions to be controlled independently, thereby achieving precise operation.

[0093] The first drive unit is the unit in the drive device responsible for realizing the overall movement of the clamping part. Its function is to drive the first clamping part 10 and the second clamping part 20 to move closer or further apart, so as to complete the clamping or release of the battery cell 100. The first drive unit can be implemented in various forms. For example, it can be a lead screw and nut mechanism driven by a servo motor, which drives the nut and the connected clamping part to perform linear reciprocating motion by rotating the lead screw; or it can be a pneumatic or hydraulic cylinder, which drives the piston rod to extend and retract by controlling the air pressure or hydraulic pressure, thereby driving the clamping part to move.

[0094] The third drive unit is the unit in the drive device responsible for realizing the rolling motion of the clamping surface. Its function is to drive the first clamping part 10 and / or the second clamping part 20, so that their clamping surfaces reciprocate along the side wall of the battery cell 100. The third drive unit can be implemented in various forms. For example, it can be an independent linear motor that directly drives the clamping part to reciprocate in a specific direction; or it can be a gear and rack mechanism driven by a stepper motor, which drives the rack and the connected clamping part to perform linear reciprocating motion through the rotation of the gear.

[0095] The first driving unit establishes a mechanical connection with the first clamping unit 10 and the second clamping unit 20, and the third driving unit establishes a driving connection with the first clamping unit 10 and / or the second clamping unit 20. The third driving unit can independently drive the clamping units to reciprocate along the sidewall of the battery cell 100 while the battery cell 100 is clamped, promoting the flow and uniform wetting of the electrolyte within the battery cell 100 through dynamic contact and pressure changes.

[0096] After the battery cell 100 is stably held by the first driving unit, the third driving unit intervenes, driving the curved clamping surface to reciprocate and roll on the side wall of the battery cell 100. This generates dynamic, moving local pressure waves in the contact area, effectively "pushing" the electrolyte, allowing for deeper penetration and more uniform distribution of the electrolyte in the dense and difficult-to-wet areas of the electrode assembly 130. Furthermore, the rolling motion helps to remove air bubbles that may be generated during the wetting process, further improving the wetting quality.

[0097] like Figures 3 to 8 As shown, in some embodiments of this application, the battery filling clamp further includes a pressure detection unit 40, which is electrically connected to the drive device. The pressure detection unit 40 includes a pressure sensor 41. The first clamping part 10 and / or the second clamping part 20 are provided with pressure sensors 41, which are used to detect the clamping force on the battery cell 100. The pressure detection unit 40 is a device for monitoring and quantifying the clamping force. The pressure detection unit 40 can be an independent module integrating signal acquisition, processing, and output functions, or it can be a distributed component that communicates with the drive device via a bus or dedicated line. For example, the pressure detection unit 40 can be a microcontroller unit that receives analog or digital signals from the pressure sensor 41 and converts them into control commands that the drive device can understand and respond to. The pressure detection unit 40 is electrically connected to the drive device, which ensures that the pressure detection unit 40 can transmit the detected clamping force data to the drive device in real time. Electrical connections can be wired, such as via data cables or control cables, or wirelessly, such as via Bluetooth, Wi-Fi, or Zigbee protocols. This allows the drive device to adjust its output based on the feedback clamping force data, achieving closed-loop control. The pressure sensor 41 is a device used to convert physical pressure into an electrical signal. For example, the pressure sensor 41 can be a resistance strain gauge pressure sensor, reflecting the pressure magnitude by detecting changes in resistance after force is applied; it can also be a piezoelectric pressure sensor, measuring pressure by utilizing the characteristic that piezoelectric materials generate charge when subjected to force; or it can be a capacitive pressure sensor, measuring pressure by detecting changes in capacitance caused by pressure. The aforementioned pressure sensor 41 has high sensitivity, fast response, and good linearity, enabling it to accurately capture subtle changes in clamping force. Both the first clamping part 10 and the second clamping part 20 are equipped with pressure sensors 41. This dual-sided arrangement ensures accurate mechanical feedback, providing a reliable basis for subsequent clamping force adjustments. By continuously monitoring these clamping forces, the force state of the battery cell 100 during the breathing clamping process can be understood in real time, providing necessary feedback information to the drive device to achieve precise force control.

[0098] The pressure detection unit 40 enables the battery liquid injection clamp to sense and precisely control the clamping force in real time when the battery cell 100 is subjected to a breathing clamping action. Specifically, when the drive device drives the first clamping part 10 and the second clamping part 20 to clamp the battery cell 100, the pressure sensor 41 installed on the first clamping part 10 and the second clamping part 20 will simultaneously detect the clamping force applied to the battery cell 100, collect and process this clamping force data, and feed it back to the drive device in real time. Based on the received clamping force data, combined with preset clamping force parameters or a breathing clamping strategy, the drive device dynamically adjusts its output, such as adjusting the amplitude, frequency, or magnitude of the movement of the first clamping part 10 and the second clamping part 20 toward or away from each other. In this way, the battery cell 100 is always within a controlled and appropriate clamping force range during the entire breathing clamping process, avoiding damage to the battery cell 100 that may be caused by excessive clamping force, and also preventing the problem of poor breathing effect caused by insufficient clamping force. This effectively promotes the uniform wetting of electrolyte inside the battery cell 100, and improves electrolyte injection efficiency and battery performance.

[0099] As an example, the pressure detection unit 40 may integrate a microcontroller that receives analog voltage signals from the pressure sensor 41 via an analog-to-digital converter (ADC), and the pressure sensor 41 may be a thin-film pressure sensor, which is characterized by its small size, fast response, and ease of integration into the vicinity of the clamping surface. When the first clamping part 10 and the second clamping part 20 clamp the battery cell 100, the thin-film pressure sensor 41 senses the pressure and outputs a corresponding electrical signal. These signals are collected by the microcontroller of the pressure detection part 40, filtered, amplified and digitized, and converted into electrical signals representing the magnitude of the clamping force. Subsequently, the microcontroller sends these electrical signals to the controller of the drive device through a serial communication interface (such as SPI or I2C). After receiving the clamping force data, the controller of the drive device compares it with a preset clamping force threshold. If the detected clamping force exceeds the preset range, the controller of the drive device will immediately issue an instruction to adjust the operating parameters of the drive part (such as a stepper motor or servo motor), such as reducing or increasing the drive current or adjusting the motion stroke, thereby adjusting the clamping state of the first clamping part 10 and the second clamping part 20 in real time to maintain the clamping force within the target range.

[0100] In this embodiment, based on the real-time feedback of clamping force from the pressure detection unit 40, the drive device can be dynamically adjusted to ensure that the clamping force is always within the optimal range. This precise clamping force control optimizes the wetting effect of the electrolyte inside the battery cell 100, improves the uniformity and efficiency of electrolyte injection, and helps to improve the production quality and performance consistency of the battery cell 100. Furthermore, this precise clamping force control can avoid physical damage to the battery cell 100 caused by improper force and helps to improve the accuracy and stability of the breathing clamping process.

[0101] like Figures 6 to 9 As shown, in some embodiments of this application, the first clamping surface 11 and / or the second clamping surface 21 are configured as spherical cap surfaces formed by rotating the first generatrix 201 around the first guideline 202, such as... Figures 9 to 11 As shown, the first generatrix 201 is an arc, and the first guideline 202 is a straight line. The first guideline 202 passes through the midpoint of the first generatrix 201 and is perpendicular to the tangent at the midpoint of the first generatrix 201. Furthermore, the first guideline 202 is also perpendicular to a plane parallel to the main body unfolding direction of the first clamping part 10 (or, the first guideline 202 is also perpendicular to a plane parallel to the main body unfolding direction of the second clamping part 20). At this time, when the first clamping surface 11 abuts against the first sidewall 101 and the second clamping surface 21 abuts against the second sidewall 102, if the surface of the battery cell 100 is not deformable, then there is point contact between the first clamping surface 11 and the first sidewall 101, and point contact between the second clamping surface 21 and the second sidewall 102. The designation of the first clamping surface 11 and / or the second clamping surface 21 as a spherical cap surface means that the clamping surface has three-dimensional curvature, and its surface is curved in all directions. This surface can be formed by precision machining of metal or high-strength engineering plastic materials with a specific radius of curvature, or by coating or molding a material with a spherical cap surface onto the clamping substrate. The contact method between the spherical cap surface and the surface of the battery cell 100 facilitates the application of high pressure to localized micro-areas of the battery cell 100 during the breathing clamping process, thereby more effectively squeezing out internal gas and promoting electrolyte penetration.

[0102] Or, such as Figures 6 to 8 , Figure 12 As shown, the first clamping surface 11 and / or the second clamping surface 21 are configured as arc surfaces formed by linearly moving the second generatrix 203 along the second guideline 204, such as... Figures 12 to 14As shown, the second generatrix 203 is an arc, and the second guideline 204 is a straight line. The second guideline 204 passes through the midpoint of the second generatrix 203 and is perpendicular to the tangent at the midpoint of the second generatrix 203. Furthermore, the second guideline 204 is parallel to a plane parallel to the main body unfolding direction of the first clamping part 10 (or, the second guideline 204 is parallel to a plane parallel to the main body unfolding direction of the second clamping part 20). At this time, when the first clamping surface 11 abuts against the first sidewall 101 and the second clamping surface 21 abuts against the second sidewall 102, if the surface of the battery cell 100 is not deformable, then the first clamping surface 11 and the first sidewall 101 are in line contact, and the second clamping surface 21 and the second sidewall 102 are in line contact. The term "arc surface" refers to a clamping surface having a single curvature direction, such as a portion of a cylindrical surface. The curved surface can be obtained by extrusion molding, bending, or CNC machining of metal, ceramic, or composite materials to achieve a curved surface, or by mounting a roller or strip with a curved surface on the clamping substrate. This contact method between the curved surface and the surface of the battery cell 100 can apply pressure to specific linear areas of the battery cell 100 during the breathing clamping process, which helps guide the electrolyte to wet along a specific path, or allows for targeted treatment of specific structures of the battery cell 100.

[0103] By selecting a spherical cap surface or an arc surface as the specific shape of the clamping surface, a more refined and targeted breathing clamping can be achieved according to the structural characteristics and wetting requirements of the battery cell 100, thereby significantly improving the wetting effect of the electrolyte.

[0104] As an exemplary specific embodiment: When it is necessary to focus on wetting a localized small area inside the battery cell 100, both the first clamping surface 11 and the second clamping surface 21 can be set as spherical cap surfaces. During the breathing clamping process, the driving device will periodically bring the spherical cap surface clamping surfaces (first clamping surface 11, second clamping surface 21) into contact with the first sidewall 101 and the second sidewall 102 of the battery cell 100. Each contact will generate a highly concentrated compressive stress point on the surface of the battery cell 100. This stress point can effectively expel the gas in the area and force the electrolyte to fill rapidly. Alternatively, when there is a specific structure inside the battery cell 100 extending along the second direction Y, and the electrolyte needs to be rapidly wetted along this direction, the first clamping surface 11 and the second clamping surface 21 can be set as arc surfaces. During the breathing clamping, the arc surface will form a linear area contact with the battery cell 100, thereby effectively promoting the diffusion of the electrolyte along this direction and ensuring rapid and uniform wetting of the electrolyte along a specific path.

[0105] In some embodiments of this application, such as Figures 6 to 8 As shown, the radius of curvature of the first clamping surface 11 is R1, as... Figure 1As shown, the first sidewall 101 has a length of L1 and a width of L2, where L1 ≥ L2, and 5*L1 ≤ R1 ≤ 10*L1; and / or, as Figures 6 to 8 As shown, the radius of curvature of the second clamping surface 21 is R2, as... Figure 1 As shown, the length of the second sidewall 102 is H1, and the width is H2, where H1 ≥ H2, and 5*H1 ≤ R2 ≤ 10*H1. The radius of curvature R1 or R2 is a key parameter measuring the degree of curvature of the first clamping surface 11 or the second clamping surface 21. It directly determines the local pressure distribution and contact area when the clamping surface contacts the battery cell 100. The radius of curvature can be achieved through precision machining or mold forming according to a preset geometry. The length L1 and width L2 of the first sidewall 101 (and the length H1 and width H2 of the second sidewall 102) are the dimensional parameters of the main surfaces of the battery cell 100. Generally, as... Figure 1 As shown, L1=H1, L2=H2, meaning that the battery cell 100 is a square cell. The proportional relationship of 5*L1≤R1≤10*L1 (and 5*H1≤R2≤10*H1) provides an optimized range for the radius of curvature R1 or R2, ensuring that when the clamping surface contacts the battery cell 100, it can generate sufficient local pressure to promote the "breathing" effect, but will not cause stress concentration due to excessive curvature, thereby avoiding damage to the battery cell 100.

[0106] By establishing a specific proportional relationship between the radius of curvature R1 of the first clamping surface 11 and the dimension L1 of the first sidewall 101 of the battery cell 100, and / or by establishing a specific proportional relationship between the radius of curvature R2 of the second clamping surface 21 and the dimension H1 of the second sidewall 102 of the battery cell 100, i.e., 5*L1≤R1≤10*L1 and / or 5*H1≤R2≤10*H1, the geometric relationship of the contact between the clamping surface and the battery cell 100 is optimized. When the driving device drives the first clamping part 10 and the second clamping part 20 to clamp the battery cell 100, the clamping surface with a specific radius of curvature can ensure that a moderate and controllable local contact area is formed on the first sidewall 101 and the second sidewall 102 of the battery cell 100, which can effectively induce the battery cell 100 to produce a small deformation, i.e., a "breathing" effect, thereby promoting the penetration of electrolyte into the difficult-to-wet areas inside the battery cell 100. Furthermore, the ratio range of the curvature radii of the first clamping surface 11 and the second clamping surface 21 avoids the risk of excessive curvature leading to an excessively large contact area and reduced breathing effect, or excessive curvature leading to excessively high contact pressure and damage to the battery cell 100. Thus, the integrity of the battery cell 100 is taken into account while ensuring the breathing effect.

[0107] As an example, the length L1 of the first sidewall 101 of the battery cell 100 is 120 mm and the width L2 is 60 mm. According to the curvature radius R1 of the first clamping surface 11, it should satisfy 5*L1≤R1≤10*L1, that is, 5*120 mm≤R1≤10*120 mm. Therefore, the range of R1 should be between 600 mm and 1200 mm. Correspondingly, the curvature radius R2 of the second clamping surface 21 is also selected to be between 600 mm and 1200 mm.

[0108] like Figures 3 to 8As shown, in some embodiments of this application, the battery filling clamp further includes a temperature sensor 60. At least one of the first clamping part 10 and the second clamping part 20 is provided with a temperature sensor 60. The temperature sensor 60 is electrically connected to the first heating device 51 and the second heating device 52. The temperature sensor 60 is used to detect the temperature of the battery cell 100 to avoid overheating of the battery cell 100. The temperature sensor 60 is a device for real-time temperature monitoring. The temperature sensor 60 can be a thermistor, whose resistance changes significantly with temperature, and the temperature can be calculated by measuring the resistance; or, the temperature sensor 60 can be a thermocouple, which measures temperature by utilizing the principle that the contact potential difference between two different conductors or semiconductors changes with temperature; or, the temperature sensor 60 can be an infrared temperature sensor, which determines the temperature by measuring the infrared energy radiated from the surface of an object in a non-contact manner. At least one of the first clamping part 10 and the second clamping part 20 is equipped with a temperature sensor 60 to ensure the accuracy and immediacy of temperature detection. To achieve this, the temperature sensor 60 can be embedded inside the first clamping part 10 or the second clamping part 20, with its sensing end in close contact with the clamping surface, thereby directly sensing the temperature of the battery cell 100; alternatively, the temperature sensor 60 can be mounted on the surface of the first clamping part 10 or the second clamping part 20, and make good contact with the clamping surface through a thermally conductive material to achieve effective heat transfer. The temperature sensor 60 is electrically connected to the first heating device 51 and the second heating device 52 to establish a feedback mechanism, enabling the detection data to regulate the operation of the heating devices. The signal from the temperature sensor 60 is transmitted to the controller of the heating devices, or the data collected by the temperature sensor 60 can be sent to the central control unit via a wireless communication module, such as Bluetooth or Wi-Fi, and then the central control unit controls the heating devices based on the data. Temperature sensor 60 is used to detect the temperature of the battery cell 100, specifically monitoring key areas to prevent abnormal temperatures. It achieves this monitoring purpose by collecting temperature data in real time and comparing it with a preset safe temperature threshold; alternatively, it transmits the collected temperature data to the control system for analysis and processing, making corresponding heating adjustments to achieve the monitoring objective. Through the coordinated action of temperature sensor 60 and the heating device, the safety of the battery cell 100 can be effectively ensured while heating promotes immersion, preventing damage from overheating.

[0109] like Figures 3 to 8 As shown, in some embodiments of this application, the battery injection fixture further includes an immersion detection structure 30, which is used to detect the degree to which any area inside the battery cell 100 is immersed in electrolyte; the immersion detection structure 30 is electrically connected to the first heating device 51 and / or the second heating device 52.

[0110] The wetting detection structure 30 is a device for real-time or near-real-time monitoring of the electrolyte distribution and wetting state inside a battery cell 100. For example, the wetting detection structure 30 can employ detection methods based on changes in ultrasonic attenuation or propagation speed, inferring the wetting condition by analyzing changes in the propagation characteristics of ultrasonic waves inside the battery; alternatively, it can use electrical methods such as electrical impedance spectroscopy (EIS) or capacitance tomography (ECT) to indirectly reflect the degree of wetting by measuring the electrical characteristics inside the battery; furthermore, it can employ non-destructive testing techniques such as X-ray imaging or neutron beam imaging to directly observe the electrolyte distribution inside the battery. The wetting detection structure 30 can detect the degree of electrolyte wetting in any area inside the battery cell 100: it can perform sectional scanning or multi-point measurement of the battery cell 100 to obtain wetting data for each area; or, it can establish a physical model of the battery cell 100 and, combined with data from a limited number of measurement points, use algorithms to calculate the overall wetting distribution map.

[0111] The immersion detection structure 30 is electrically connected to the first heating device 51 and / or the second heating device 52, aiming to achieve linkage between the immersion state and heating control. Specifically, the controller of the immersion detection structure 30 can output signals to adjust the power or operating mode of the first heating device 51 and / or the second heating device 52 to achieve precise heating of a specific area; or, the immersion detection structure 30 can send immersion data to the central control unit, which will adjust the operating state of the first heating device 51 and / or the second heating device 52 according to a preset strategy.

[0112] In other embodiments, the wetting detection structure 30 is electrically connected to the driving device. The wetting detection structure 30 controls the driving device to drive the first clamping part 10 and the second clamping part 20 to perform targeted movements based on the data that the electrode assembly 130 of the battery cell 100 is wetted by the electrolyte, so as to promote the degree of wetting of the difficult-to-wet areas of the electrode assembly 130 of the battery cell 100.

[0113] The wetting detection structure 30 is electrically connected to the drive device to ensure that the wetting detection structure 30 can transmit the detected data to the drive device in real time or near real time, so that the drive device can respond based on the data. The electrical connection can be achieved via wired communication methods such as RS232, RS485, or Ethernet, connecting the controller of the wetting detection structure 30 to the controller of the drive device; alternatively, the electrical connection can also be achieved via wireless communication methods such as Wi-Fi, Bluetooth, or ZigBee. The wetting detection structure 30 controls the drive device to drive the first clamping part 10 and the second clamping part 20 to perform targeted movements based on the detected data of the battery cell 100 being wetted by the electrolyte. This is the core mechanism for promoting the wetting degree of difficult-to-wet areas. When insufficient wetting is detected in a certain area, the wetting detection structure 30 can instruct the driving device to increase the clamping force, clamping frequency, or change the clamping position corresponding to that area to squeeze the battery cell 100 and promote electrolyte flow. Alternatively, the wetting detection structure 30 can dynamically adjust the reciprocating range or speed of the first clamping part 10 and / or the second clamping part 20 based on wetting data, causing them to perform a longer or more vigorous "rubbing" action in the difficult-to-wet areas. In this way, through the above-mentioned targeted control, the degree of wetting in the difficult-to-wet areas within the battery cell 100 can be promoted, solving the problem of uneven electrolyte wetting.

[0114] As an exemplary embodiment, the wetting detection structure 30 can be configured with multiple ultrasonic sensor arrays, distributed outside or inside the first clamping part 10 and the second clamping part 20, for real-time transmission and reception of ultrasonic signals. During electrolyte injection into the battery cell 100, these ultrasonic signals penetrate the battery cell 100, and their propagation speed and attenuation vary depending on the degree of electrolyte wetting. The control unit of the wetting detection structure 30 receives and analyzes this ultrasonic data to construct a wetting distribution map inside the battery cell 100. For example, when it is detected that a certain local area of ​​the battery cell 100 (e.g., the area near the edge of the electrode sheet) has low ultrasonic attenuation or high propagation speed, indicating insufficient electrolyte wetting in that area, the wetting detection structure 30 sends a command to the driving device to promote electrolyte penetration through mechanical action, and / or, the wetting detection structure 30 sends commands to the first heating device 51 and the second heating device 52 to adjust the power or operating mode of the first heating device 51 and / or the second heating device 52.

[0115] like Figures 3 to 8As shown, in some embodiments of this application, the wetting detection structure 30 includes an ultrasonic transmitter 31, an optical microphone 32, and a feedback control component 33. The ultrasonic transmitter 31 and the optical microphone 32 are respectively located on opposite sides of the battery cell 100. The ultrasonic transmitter 31 emits ultrasonic waves into the battery cell 100. The feedback control component 33 is electrically connected to the optical microphone 32 and to the first heating device 51 and / or the second heating device 52. The feedback control component 33 controls the first heating device 51 and / or the second heating device 52 to adjust their power or operating mode based on data fed back from the optical microphone 32, thereby promoting the wetting degree of difficult-to-wet areas within the battery cell 100.

[0116] in:

[0117] The ultrasonic transmitter 31 is a device capable of generating ultrasonic signals. Its function is to act as a detection source, emitting ultrasonic waves into the interior of the battery cell 100, and utilizing the differences in the propagation characteristics of ultrasonic waves in different media (such as electrolyte, air, or internal battery materials) to detect the wetting state. The ultrasonic transmitter 31 can employ a piezoelectric ceramic transducer, which generates ultrasonic waves by applying a high-frequency electrical signal to cause it to vibrate; alternatively, the ultrasonic transmitter 31 can employ an electromagnetic ultrasonic transducer, which generates ultrasonic waves through electromagnetic induction.

[0118] The optical microphone 32 is an acoustic sensor based on the principle of optical interference. Unlike traditional microphones that convert sound waves into electrical signals through a diaphragm, the optical microphone 32 directly detects physical changes (such as fluctuations in air refractive index or surface micro-vibrations) caused by sound waves, offering advantages such as no electromagnetic interference, wide frequency response, and high sensitivity. The optical microphone 32 receives ultrasonic signals passing through the battery cell 100 and converts them into analyzable optical data to assess the propagation characteristics of ultrasonic waves within the battery, thereby inferring the degree of electrolyte wetting. Its characteristics of no electromagnetic interference, wide frequency response, and high sensitivity give it significant advantages in battery electrolyte filling environments. The optical microphone 32 can be structured based on a fiber optic interferometer (e.g., a Fabry-Perot interferometer or a Mach-Zehnder interferometer), where sound waves cause micro-vibrations in the fiber or diaphragm, changing the optical path difference and resulting in changes in interference fringes; alternatively, the optical microphone 32 can be based on the principle of laser Doppler vibration measurement, detecting the Doppler frequency shift caused by surface micro-vibrations induced by sound waves.

[0119] The feedback control component 33 is a processing unit used to receive and analyze data and issue control commands. Its function is to receive ultrasonic data fed back from the optical microphone 32, analyze the wetting state inside the battery cell 100, especially identifying difficult-to-wet areas, and generate control commands based on the analysis results, sending them to the drive device to adjust the motion strategies of the first clamping part 10 and the second clamping part 20. The feedback control component 33 can be composed of a microcontroller (MCU), digital signal processor (DSP), or programmable logic controller (PLC), integrating corresponding signal processing algorithms and control logic; alternatively, the feedback control component 33 can adopt a control system based on an industrial computer (IPC), implementing data analysis and control functions through software. The ultrasonic transmitter 31 and the optical microphone 32 are respectively located on both sides of the battery cell 100, forming a transmissive ultrasonic detection path, allowing ultrasonic waves to penetrate the battery cell 100 and thus comprehensively detect its internal wetting state.

[0120] In this embodiment, ultrasonic waves are emitted to the battery cell 100 via an ultrasonic transmitter 31. After penetrating the battery cell 100, the ultrasonic waves are received by an optical microphone 32 located on the other side. Because the propagation characteristics (e.g., attenuation, sound velocity) of ultrasonic waves differ significantly in different media such as electrolyte and air, the optical microphone 32 can accurately capture these changes in propagation characteristics with its high sensitivity and resistance to electromagnetic interference. The feedback control component 33 receives and analyzes the ultrasonic data fed back by the optical microphone 32, thereby identifying the electrolyte wetting state inside the battery cell 100 in real time and accurately, particularly locating difficult-to-wet areas where bubbles exist or wetting is insufficient. Based on this precise wetting data, the feedback control component 33 intelligently generates control commands: the drive device adjusts the breathing-style clamping motion of the first clamping part 10 and the second clamping part 20 according to the commands, such as adjusting the clamping pressure, frequency, or intermittent contact position, to specifically act on the difficult-to-wet areas, which helps to promote the electrolyte to penetrate more evenly into all corners of the battery cell 100, improving the injection efficiency and wetting uniformity; or, the first heating device 51 and the second heating device adjust the power or working mode of the first heating device 51 and / or the second heating device 52 according to the commands, to specifically act on the difficult-to-wet areas, which helps to promote the electrolyte to penetrate more evenly into all corners of the battery cell 100, improving the injection efficiency and wetting uniformity.

[0121] According to a second aspect of the embodiments of this application, embodiments of this application also provide a battery production line, including the aforementioned battery liquid injection fixture.

[0122] A battery production line refers to a complete system used for the automated or semi-automated production of battery products. It encompasses a series of continuous production processes, from raw material processing, electrode fabrication, cell assembly, electrolyte injection, formation, capacity testing to final testing and packaging. This production line aims to achieve efficient, stable, and high-quality battery production by integrating various specialized equipment and control systems.

[0123] In this battery production line, the aforementioned battery injection fixture is a device specifically designed to hold the battery cell 100 during the battery injection process. The core feature of this fixture is that its first clamping surface 11 is configured as a curved surface convex towards the second clamping surface 21. Driven by a driving device, it can perform a "breathing" clamping motion on the battery cell 100, aiming to promote sufficient electrolyte penetration into the battery cell by intermittently applying and releasing pressure, thereby optimizing the injection effect.

[0124] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery electrolyte filling clamp, characterized in that, The device includes a driving device, a first clamping part, a second clamping part, and a first heating device. The driving device is drivenly connected to the first clamping part and the second clamping part. One of the first clamping part and the second clamping part is provided with the first heating device. The first heating device is used to heat one of the first clamping part and the second clamping part. The first clamping part has a first clamping surface, and the second clamping part has a second clamping surface. The first clamping surface and the second clamping surface are disposed opposite to each other. The battery cell has a first sidewall and a second sidewall along a first direction. When the first clamping part and the second clamping part clamp the battery cell, at least a portion of the first clamping surface abuts against at least a portion of the first sidewall, and at least a portion of the second clamping surface abuts against at least a portion of the second sidewall. Wherein: the first heating device intermittently changes its relative position with respect to the corresponding sidewall of the battery cell along a second direction, the second direction being perpendicular to the first direction.

2. The battery liquid injection clamp according to claim 1, characterized in that, The battery liquid injection clamp also includes a second heating device. The other of the first clamping part and the second clamping part is provided with the second heating device. The first heating device and the second heating device synchronously heat the first clamping part and the second clamping part respectively. Furthermore, the relative position of the second heating device relative to the corresponding side wall of the battery cell is intermittently changed along the second direction.

3. The battery liquid injection clamp according to claim 2, characterized in that, The driving device includes a first driving part and a second driving part, and both the first driving part and the second driving part are drivingly connected to the first clamping part and the second clamping part. The first driving unit is used to drive the first clamping unit and the second clamping unit to move closer to each other or move further away from each other to continuously clamp the battery cell or release the battery cell; The second driving part is used to drive the first clamping part and the second clamping part to move synchronously relative to the battery cell along the second direction.

4. The battery electrolyte injection clamp according to claim 3, characterized in that, Both the first clamping surface and the second clamping surface are planar, and the first heating device and the second heating device are fixedly installed corresponding to the middle region of the first clamping part and the middle region of the second clamping part, respectively.

5. The battery electrolyte injection clamp according to claim 2, characterized in that, The first heating device and the second heating device are respectively movably disposed in the first clamping part and the second clamping part; The driving device includes a first driving part and a third driving part, wherein the first driving part is drivingly connected to the first clamping part and the second clamping part; The first driving unit is used to drive the first clamping unit and the second clamping unit to move closer to each other or move further away from each other, so as to continuously clamp the battery cell or release the battery cell; The third driving unit is driven to connect with the first heating device and the second heating device, and the third driving unit is used to drive the first heating device and the second heating device to move synchronously along the second direction.

6. The battery liquid injection clamp according to claim 5, characterized in that, The first clamping surface is a plane, and the area of ​​the first clamping surface is greater than or equal to the area of ​​the first sidewall; And / or, the second clamping surface is a plane, and the area of ​​the second clamping surface is greater than or equal to the area of ​​the second sidewall.

7. The battery electrolyte injection clamp according to claim 2, characterized in that, The first clamping surface is configured as a curved surface protruding toward the second clamping surface, and at least a portion of the first clamping surface intermittently abuts against the corresponding portion of the first sidewall in a second direction.

8. The battery electrolyte injection clamp according to claim 7, characterized in that, The second clamping surface is configured as a curved surface protruding toward the first clamping surface, and at least a portion of the second clamping surface intermittently abuts against the corresponding portion of the second sidewall along the second direction.

9. The battery electrolyte injection clamp according to claim 8, characterized in that, The driving device includes a first driving part and a second driving part. Both the first driving part and the second driving part are drivenly connected to the first clamping part and the second clamping part. The first driving part is used to drive the first clamping part and the second clamping part to move closer to each other or further away from each other. The second driving part is used to drive the first clamping part and the second clamping part to move synchronously relative to the battery cell along the second direction. The first driving part drives the first clamping part and the second clamping part to intermittently abut against the corresponding portions of the corresponding sidewalls of the battery cell.

10. The battery liquid injection clamp according to claim 8, characterized in that, The driving device includes a first driving unit and a third driving unit; The first driving unit is driven to be connected to the first clamping unit and the second clamping unit. The first driving unit is used to drive the first clamping unit and the second clamping unit to move closer to each other or move further away from each other, so as to continuously clamp the battery cell or release the battery cell. The third driving part is driven to the first clamping part, and the third driving part is used to drive the first clamping part to move so that the first clamping surface reciprocates along the first side wall; and / or, the third driving part is driven to the second clamping part, and the third driving part is used to drive the second clamping part so that the second clamping surface reciprocates along the second side wall.

11. The battery electrolyte filling clamp according to any one of claims 1-10, characterized in that, The battery liquid injection clamp also includes a pressure detection unit, which is electrically connected to the driving device. The pressure detection unit includes a pressure sensor, and the first clamping part and / or the second clamping part are provided with the pressure sensor. The pressure sensor is used to detect the clamping force on the battery cell.

12. The battery liquid filling clamp according to any one of claims 7-10, characterized in that, The first clamping surface and / or the second clamping surface are configured as spherical cap surfaces formed by rotating the first generatrix around the first directrix; Alternatively, the first clamping surface and / or the second clamping surface may be configured as an arc surface formed by linearly moving the second generatrix along the second guideline.

13. The battery liquid injection clamp according to claim 12, characterized in that, The radius of curvature of the first clamping surface is R1, the length of the first sidewall is L1, and the width is L2, wherein L1≥L2, and 5*L1≤R1≤10*L1; And / or, the radius of curvature of the second clamping surface is R2, the length of the second sidewall is H1, and the width is H2, wherein H1≥H2, and 5*H1≤R2≤10*H1.

14. The battery liquid filling clamp according to any one of claims 2-10, characterized in that, The battery liquid injection clamp also includes a temperature sensor. At least one of the first clamping part and the second clamping part is provided with the temperature sensor. The temperature sensor is electrically connected to the first heating device and the second heating device. The temperature sensor is used to detect the temperature of the battery cell.

15. The battery liquid filling clamp according to any one of claims 2-10, characterized in that, The battery electrolyte injection fixture also includes a wetting detection structure, which is used to detect the degree to which any area inside the battery cell is wetted by electrolyte; The wetting detection structure is electrically connected to the first heating device and / or the second heating device; and / or, the wetting detection structure is electrically connected to the driving device.

16. The battery liquid injection clamp according to claim 15, characterized in that, The immersion detection structure includes an ultrasonic transmitter, an optical microphone, and a feedback control component. The ultrasonic transmitter and the optical microphone are respectively located on both sides of the battery cell. The ultrasonic transmitter is used to emit ultrasonic waves to the battery cell. The feedback control component is electrically connected to the optical microphone and is also electrically connected to the first heating device and / or the second heating device.

17. A battery production line, characterized in that, Includes the battery liquid injection clamp as described in any one of claims 1-16.

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