A drying equipment

Abstract

This application relates to the field of battery technology, and in particular to a drying device, including a drying chamber and a detection mechanism. The drying chamber includes a chamber body and a sealing cover. The chamber body has a receiving cavity and a chamber opening. The chamber opening is used for battery cells to enter the receiving cavity, and the sealing cover seals the chamber opening. The detection mechanism includes a first driving device and a humidity sensor. The humidity sensor is disposed in the receiving cavity, and the first driving device is connected to the humidity sensor and the chamber body. During the drying process, the first driving device drives the temperature sensor to move towards the liquid injection hole, so that the humidity sensor can detect the humidity of the gas flowing out of the liquid injection hole in a timely manner, avoiding over-drying or under-drying of the battery cells. The first driving device drives the temperature sensor to move to a position away from the liquid injection hole, so that the humidity sensor is farther away from the battery cells, making it easier to remove the dried batteries from the receiving cavity and to move the undried battery cells into the receiving cavity.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a drying device. Background Technology

[0002] The moisture content in lithium-ion batteries is closely related to the consistency of individual battery cells and the safety of the final battery pack. Controlling the moisture content is extremely important for lithium-ion batteries. Too much or too little moisture in the positive electrode materials, negative electrode materials, and separator of a lithium-ion battery cell will adversely affect the battery's performance. On the one hand, excessive moisture will react with lithium salts in the electrolyte, such as L... i PF6 reacts to form hydrofluoric acid, which corrodes the current collector and electrode materials, leading to capacity decay and increased internal resistance. On the other hand, the formation of the SEI (Solid Electrolyte Interphase) film requires trace amounts of moisture, as this promotes the formation of dense Li₂CO₃, LiF, and other SEI components, enhancing the stability of the SEI film. Therefore, the battery cells need to be dried before electrolyte injection to control the moisture content within an appropriate range. Utility Model Content

[0003] Based on this, the purpose of this application is to provide a drying device that can control the moisture content in battery cells within an appropriate range. The drying device of this application includes a drying chamber and a testing mechanism.

[0004] The drying chamber includes a chamber body and a sealing cover. The chamber body has a receiving cavity and a chamber opening. The chamber opening is used to allow individual battery cells to enter the receiving cavity. The sealing cover covers the chamber opening.

[0005] The detection mechanism includes a first driving device and a humidity sensor. The first driving device is disposed in the housing, and the humidity sensor is disposed in the receiving cavity. The first driving device is connected to the humidity sensor. The first driving device is configured to drive the humidity sensor to move closer to or further away from the liquid injection hole of the battery cell.

[0006] As an optional solution, the drying equipment has a first direction and a second direction arranged vertically; the drying equipment also includes a material tray for arranging multiple battery cells, and the opening is located on one side of the housing in the second direction, the opening being used for the material tray to enter the receiving cavity;

[0007] The humidity sensor has a detection head, at least a portion of which is opposite to at least a portion of one of the injection holes in the first direction, and the first driving device is configured to drive the humidity sensor toward or away from the injection hole in the first direction.

[0008] As an optional solution, the tray includes a pallet and a positioning plate. The pallet includes a bottom support plate and side members disposed around the bottom support plate. The bottom support plate and the side members form a receiving groove, and the positioning plate is disposed in the receiving groove.

[0009] The positioning plate has multiple positioning spaces, and at least a portion of one of the battery cells is housed in one of the positioning spaces.

[0010] As an optional solution, the positioning space is a positioning hole that passes through the positioning plate along the first direction, and the battery cell abuts against the bottom support plate on one side in the first direction;

[0011] The base plate is a heat-conducting plate, and an electric heating wire is embedded in the base plate.

[0012] As an optional solution, the box body includes a first plate, a second plate, and a side panel; in the first direction, one side of the side panel is connected to the first plate, and the other side is connected to the second plate, the first plate, the second plate, and the side panel enclose the receiving cavity, and the box opening is located on one side of the side panel in the second direction;

[0013] The first driving device is a telescopic device. In the first direction, one side of the telescopic device is connected to the first plate, and the other side is connected to the humidity sensor; the battery cell is disposed on the second plate.

[0014] As an optional solution, the drying equipment also has a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other;

[0015] The drying equipment further includes a first sliding member, a first connecting rod, and a second driving device. The first sliding member, the first connecting rod, and the second driving device are disposed on the same side of the housing in the third direction. The first sliding member is slidably connected to the housing along the second direction. The first connecting rod is rotatably connected to the first sliding member. The sealing cover is connected to the end of the first connecting rod away from the first sliding member.

[0016] The second driving device is configured to drive the first sliding member to move away from the box opening along the second direction, so that the first connecting rod drives the sealing cover to press against the outer periphery of the box opening. The second driving device is also configured to drive the first sliding member to move closer to the box opening along the second direction, so that the first connecting rod drives the sealing cover to disengage from the outer periphery of the box opening.

[0017] As an optional solution, the drying equipment has a first direction and a second direction arranged vertically; the first direction is the up-down direction; the box body includes a first plate, a second plate and a side panel, the first plate, the second plate and the side panel enclose the receiving cavity, the first plate is located at the top of the box body and the second plate is located at the bottom of the box body;

[0018] The drying equipment includes a weighing sensor and a material tray. The weighing sensor is disposed on the second plate, and the material tray is disposed on the weighing sensor. The material tray is used to hold the battery cells.

[0019] As an optional feature, the drying equipment also includes a temperature sensor located in the receiving cavity and connected to one end of the driving device near the liquid injection port.

[0020] As an optional solution, the drying equipment further includes a first pipe connector and a second pipe connector, both of which are connected to the housing. The first pipe connector is used to connect to a vacuum device, and the second pipe connector is used to connect to an inert gas supply device.

[0021] As an optional solution, the drying equipment also includes a gas pressure sensor, which includes a connection end and a test end. The connection end is connected to the housing, and the test end is located in the receiving cavity.

[0022] Compared with the prior art, the beneficial effects of this application are as follows:

[0023] The drying equipment of this application includes a drying chamber and a detection mechanism. The drying chamber includes a chamber body and a sealing cover. The chamber body has a receiving cavity and a chamber opening. The chamber opening is used for battery cells to enter the receiving cavity. The sealing cover seals the chamber opening. The detection mechanism includes a first driving device and a humidity sensor. The humidity sensor is disposed in the receiving cavity. The first driving device is connected to the humidity sensor and the chamber body. During the drying process, the first driving device drives the temperature sensor to move towards the liquid injection hole, thereby moving the humidity sensor to a position closer to the liquid injection hole. This allows the humidity sensor to detect the humidity of the gas flowing out of the liquid injection hole in a timely manner. Once the humidity sensor's test value reaches the set range, it indicates that the battery cell has been dried properly, preventing over-drying or under-drying of the battery cell. Subsequently, the first driving device drives the temperature sensor to a position away from the liquid injection hole, so that the humidity sensor is farther away from the battery cell. This facilitates the removal of the dried battery cell from the receiving cavity and the removal of the undried battery cell from the receiving cavity. Attached Figure Description

[0024] Figure 1 This is a first isometric view of the drying equipment of this application with the sealed cover open;

[0025] Figure 2 This is a second isometric view of the drying equipment of this application with the sealed cover open;

[0026] Figure 3 This is a front view of the drying equipment of this application with the sealed cover open;

[0027] Figure 4 yes Figure 3 Sectional view along axis AA;

[0028] Figure 5 This is a schematic diagram of the drying device of this application when the humidity sensor is close to the liquid injection hole;

[0029] Figure 6 This is a side view of the drying equipment of this application with the sealed cover closed;

[0030] Figure 7 It is an isometric view of the material tray;

[0031] Figure 8 It is an exploded view of the material tray;

[0032] In the diagram, Z represents the first direction, X the second direction, Y the third direction, 100 the battery cell, 101 the electrolyte filling hole, 1 the drying oven, 11 the oven body, 111 the receiving cavity, 112 the oven opening, 113 the first plate, 114 the second plate, 115 the side panel, 1151 the first side, 1152 the second side, 12 the sealing cap, 121 the first end, 122 the second end, 2 the detection mechanism, 21 the first drive device, 22 the humidity sensor, and 2... 21. Detection head; 3. Material tray; 31. Pallet; 311. Bottom support plate; 312. Side panel; 313. Receiving groove; 32. Positioning plate; 321. Positioning space; 4. Weighing sensor; 5. Temperature sensor; 61. First pipe connector; 62. Second pipe connector; 7. Gas pressure sensor; 81. First sliding member; 82. First connecting rod; 83. Second drive device; 84. Second sliding member; 85. Second connecting rod; 86. Third drive device; 9. Support frame. Detailed Implementation

[0033] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0034] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -5° to 5°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 85° to 95°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0038] like Figures 1 to 8As shown, a preferred embodiment of the drying equipment of this application includes a drying chamber 1 and a detection mechanism 2. The drying chamber 1 includes a chamber body 11 and a sealing cover 12. The chamber body 11 has a receiving cavity 111 and a chamber opening 112. The receiving cavity 111 provides a closed drying space for the battery cell 100. The chamber opening 112 serves as an entry and exit channel for the battery cell 100, allowing the battery cell 100 to enter the receiving cavity 111. The sealing cover 12 seals the chamber opening 112. The detection mechanism 2 includes a first driving device 21 and a humidity sensor 22. The first driving device 21 is disposed in the chamber body 11, and the humidity sensor 22 is disposed in the receiving cavity 111. The first driving device 21 is connected to the humidity sensor 22. The first driving device 21 is configured to drive the humidity sensor 22 to approach or move away from the liquid injection hole 101 of the battery cell 100. The liquid injection hole 101 serves as a liquid injection hole for the battery cell 100. The main escape channel for gas (including evaporated moisture) inside the cell 100, the humidity change near the injection hole 101 can directly reflect the dryness inside the cell 100. The first driving device 21 provides an adjustable moving path for the humidity sensor 22, allowing the humidity sensor 22 to switch between a detection position close to the injection hole 101 and a avoidance position away from the injection hole 101. During the drying process, the first driving device 21 drives the temperature sensor 5 to move towards the injection hole 101, thereby moving the humidity sensor 22 to the detection position, so that the humidity sensor 22 can detect the humidity of the gas flowing out of the injection hole 101 in a timely manner. At the detection position, the humidity sensor 22 is closer to the injection hole 101, which allows the detection result of the humidity sensor 22 to be closer to the inside of the cell 100. Once the humidity sensor 22 reaches the set range, it indicates that the battery cell 100 has been dried. Then, the temperature sensor 5 is moved to a position away from the liquid injection hole 101 by the first driving device 21, so that the humidity sensor 22 is far away from the battery cell 100, making room for the battery cell 100 to be removed and placed. This makes it easier to move the dried battery cell 100 out of the box opening 112 to the outside of the receiving cavity 111, and to move the undried battery cell 100 into the receiving cavity 111 from the box opening 112.

[0039] In some embodiments of this application, the drying equipment has a vertically arranged first direction Z and a second direction X; the drying equipment also includes a tray 3 for holding multiple battery cells 100, and a box opening 112 is disposed on one side of the box body 11 in the second direction X, for feeding the tray 3 into the receiving cavity 111; the humidity sensor 22 has a detection head 221, at least a portion of which is opposite to at least a portion of a liquid injection hole 101 in the first direction Z; the first driving device 21 is configured to drive the humidity sensor 22 to move closer to or further away from the liquid injection hole 101 along the first direction Z. Specifically, in this embodiment, the first direction Z is the vertical direction, and the second direction X is the horizontal direction. When picking up or putting down the tray 3, the first driving device 21 drives the humidity sensor 22 to move upward to a clearance position, facilitating the tray 3 to enter and exit the receiving cavity 111 horizontally through the box opening 112. After the material tray 3 is placed into the receiving cavity 111 and the sealing cover 12 is covered, the humidity sensor 22 is driven to move down to the detection position by the first driving device 21. The injection hole 101 is opened facing upwards. The detection head 221 of the humidity sensor 22 is at least partially vertically opposite to the injection hole 101. The detection head 221 is directly aligned with the gas escape path of the injection hole 101. The humid gas escaping from the injection hole 101 can be preferentially detected by the detection head 221.

[0040] In some embodiments of this application, such as Figure 7 , Figure 8 As shown, the material tray 3 includes a pallet 31 and a positioning plate 32. The pallet 31 includes a bottom support plate 311 and side members 312 disposed around the bottom support plate 311. The bottom support plate 311 and the side members 312 surround and form a receiving groove 313, forming a bounded space. The positioning plate 32 is disposed in the receiving groove 313, and the receiving groove 313 limits the positioning plate 32 placed inside, preventing the positioning plate 32 from shifting when the material tray 3 enters or exits the drying chamber 1 or during the drying process. The positioning plate 32 has multiple positioning spaces 321, at least partially accommodating a battery cell 100. Placed in a positioning space 321, the positioning plate 32 positions the battery cell 100 through multiple positioning spaces 321, ensuring that the position of each battery cell 100 in the material tray 3 is relatively fixed, so that the position of the liquid injection hole 101 can maintain a preset alignment relationship with the detection head 221 of the humidity sensor 22 in the drying oven 1, avoiding the misalignment of the detection head 221 and the liquid injection hole 101 due to the displacement of the battery cell 100, which would affect the humidity detection accuracy; the bottom support plate 311 serves as a bearing base, providing stable support for the entire material tray 3 and the battery cell 100.

[0041] In some embodiments of this application, such as Figure 8As shown, the positioning space 321 is a positioning hole that passes through the positioning plate 32 along the first direction Z. One side of the battery cell 100 in the first direction Z abuts against the bottom support plate 311. The positioning hole passes through the positioning plate 32 vertically. After the lower end of the battery cell 100 passes through the positioning hole, it abuts against the upper end of the bottom support plate 311. The hole wall of the positioning hole can restrict the horizontal displacement of the battery cell 100 in the circumferential direction, and the support of the bottom support plate 311 restricts its movement in the vertical direction, so that the posture of the battery cell 100 in the tray 3 is fixed. Among them, the bottom support plate 311 is a heat-conducting plate, and an electric heating wire is embedded in the bottom support plate 311. The heating of the traditional drying oven 1 mostly relies on the heaters on the side wall or top of the oven body 11. The heat transfer to the battery cell 100 needs to pass through the air medium and relies on thermal radiation for heat transfer. In this embodiment, the bottom support plate 311 directly contacts the bottom of the battery cell 100. The bottom support plate 311 is made of heat-conducting materials such as aluminum alloy or copper alloy and has an embedded electric heating wire. The heat generated by the heating wire is directly transferred to the battery cell 100 through heat conduction, making the heating more direct and uniform. Moreover, the heat source at the bottom allows the temperature inside the drying chamber 1 to gradually decrease from bottom to top, which can accelerate the evaporation of bound water inside the battery cell 100 (such as electrode materials and separators) and overflow upwards to the outside of the battery cell 100, thereby improving the drying efficiency.

[0042] In some embodiments of this application, multiple humidity sensors 22 are provided, and the multiple humidity sensors 22 are distributed at intervals in the receiving cavity 111. One humidity sensor 22 corresponds to one liquid injection port. The first driving device 21 may be provided in multiple or one way. When multiple first driving devices 21 are provided, one humidity sensor 22 is connected to one first driving device 21. When one first driving device 21 is provided, the output end of the first driving device 21 is connected to a connecting frame, and multiple humidity sensors 22 are all connected to the connecting frame.

[0043] In some embodiments of this application, the housing 11 includes a first plate 113, a second plate 114, and a side panel 115. In the first direction Z, one side of the side panel 115 is connected to the first plate 113, and the other side is connected to the second plate 114. The first plate 113, the second plate 114, and the side panel 115 enclose a receiving cavity 111. The opening 112 is located on one side of the side panel 115 in the second direction X. The housing 11 is rectangular in shape, and the opening 112 is located on one side of the housing 11. The driving device is a telescopic device. In the first direction Z, one side of the telescopic device is connected to the first plate 113, and the other side is connected to the humidity sensor 22. The battery cell 100 is located on the second plate 114. The telescopic device can be a pneumatic cylinder or a hydraulic cylinder. The axis of the telescopic device is vertically arranged. When the telescopic device extends, it can drive the humidity sensor 22 downward to the detection position. When the telescopic device shortens, it can drive the humidity sensor 22 upward to the avoidance position.

[0044] In some embodiments of this application, the drying device further has a third direction Y, and the first direction Z, the second direction X, and the third direction Y are mutually perpendicular; such as Figure 3 , Figure 6 As shown, the drying equipment also includes a first sliding member 81, a first connecting rod 82, and a second driving device 83. The first sliding member 81, the first connecting rod 82, and the second driving device 83 are disposed on the same side of the housing 11 in the third direction Y. The first sliding member 81 is slidably connected to the housing 11 in the second direction X. The first connecting rod 82 is rotatably connected to the first sliding member 81 and can rotate up and down relative to the first sliding member 81. The sealing cover 12 is connected to the end of the first connecting rod 82 away from the first sliding member 81 and is fixed perpendicularly to the first connecting rod 82. The second driving device 83 is configured to drive the first sliding member 81 to move in the second direction X away from the opening 112, so that the first connecting rod 82 drives the sealing cover 12 to press against the outer periphery of the opening 112. When the sealing cover 12 is pressed against the outer periphery of the opening 112, in the second direction X, the sealing cover 12 and the second driving device 83 are respectively located on both sides of the opening 112, and the first connecting rod 82 is in a horizontal state and the sealing cover 12 is in a vertical state. The length direction of the connecting rod 82 is arranged along the second direction X. When the first sliding member 81 moves away from the box opening 112 along the second direction X, the linear motion of the first sliding member 81 is converted into the pressing force of the sealing cover 12 on the box opening 112 through the first connecting rod 82. As the moving distance of the first sliding member 81 increases, the pressing force can gradually increase to ensure the sealing of the receiving cavity 111. The second driving device 83 is also configured to drive the first sliding member 81 to move closer to the box opening 112 along the second direction X. When the second driving device 83 drives the first sliding member 81 to move closer to the box opening 112 along the second direction X, the first connecting rod 82 rotates downward under the gravity of the sealing cover 12. The sealing cover 12 and the end of the first connecting rod 82 away from the second driving device 83 swing downward to the bottom of the box body 11, thereby causing the sealing cover 12 to detach from the outer periphery of the box opening 112 and making room for the material tray 3 to enter and exit the receiving cavity 111 along the second direction X. At this time, the first connecting rod 82 is in a vertical state and the sealing cover 12 is in a horizontal state.

[0045] In some embodiments of this application, to ensure the stable opening and closing of the sealing cover 12, the drying equipment further includes a second sliding member 84, a second connecting rod 85, and a third driving device 86. The housing 11 has a first side 1151 and a second side 1152 arranged opposite to each other in the second direction X. The first sliding member 81, the first connecting rod 82, and the second driving device 83 are all disposed on the first side 1151. The second sliding member 84, the second connecting rod 85, and the third driving device 86 are all disposed on the second side 1152. The second sliding member 84 is symmetrically arranged with the first sliding member 81 and is slidably connected to the second side 1152. The second connecting rod 85 is symmetrically arranged with the first connecting rod 82, and one end of the second connecting rod 85 is rotatably connected to the second sliding member 84. The sealing cover 12 is fixedly connected to the end of the second connecting rod 85 away from the second sliding member 84 on the side of the second direction X away from the first connecting rod 82. The third driving device 86 and the second driving device 83 are symmetrically arranged, and the third driving device 86 can drive the second sliding member 84 to slide along the second direction X. In this embodiment, the third driving device 86 and the second driving device 83 can be pneumatic cylinders or hydraulic cylinders.

[0046] In some embodiments of this application, the drying equipment includes a weighing sensor 4, which is disposed on the second plate 114, and a material tray 3 is disposed on the weighing sensor 4. The weight of the material tray 3 and the battery cell 100 is transmitted to the second plate 114 through the weighing sensor 4. During the drying process, the evaporation of moisture in the battery cell 100 causes the overall weight to gradually decrease. The weighing sensor 4 can monitor the total weight change of the material tray 3 and the battery cell 100 in real time. When the rate of weight decrease tends to stabilize, combined with the detection result of the humidity sensor 22, it is jointly determined that the battery cell 100 has been dried properly, avoiding the errors that may exist in single humidity detection, such as local moisture residue but overall humidity meeting the standard. The humidity sensor 22 and the weighing sensor 4 work together to avoid over-drying or under-drying due to misjudgment of a single mass or humidity.

[0047] In some embodiments of this application, such as Figure 5 As shown, the drying equipment also includes a support frame 9. A weighing sensor 4 is fixedly connected to the upper end of each of the four corners of the support frame 9. The material tray 3 is placed on the four weighing sensors 4, and the sum of the test values ​​of the four weighing sensors 4 is the total weight of the material tray 3 and the battery cell 100. The support frame 9 is fixedly or detachably connected to the second plate 114. To facilitate positioning of the material tray 3 in the receiving cavity 111, multiple limiting posts are also fixed on the second plate 114. The height of each limiting post is slightly higher than the sum of the heights of the support frame 9 and the weighing sensors 4. Each limiting post encloses a limiting space, and the entire support frame 9 is located in the limiting space. The lower part of the material tray 3 is located in the limiting space, and the lower end of the material tray 3 abuts against the upper end of each weighing sensor 4. The sidewalls of each limiting post abut against the outer periphery of the material tray 3, thereby limiting the horizontal direction of the material tray 3.

[0048] In some embodiments of this application, the drying equipment further includes a temperature sensor 5, which is located in the receiving cavity 111 and connected to the end of the driving device near the liquid injection port 101. Temperature affects the rate of moisture evaporation, and temperature and humidity have a synergistic relationship. By setting the temperature sensor 5, the temperature value at the liquid injection port can be monitored in real time, and the power of the heating wire can be adjusted according to the temperature value to control the temperature value within a suitable range for moisture evaporation, which is beneficial to improving drying efficiency.

[0049] In some embodiments of this application, the drying equipment further includes a first pipe connector 61 and a second pipe connector 62, both of which are connected to the housing 11. The first pipe connector 61 is used to connect to a vacuum device, and the second pipe connector 62 is used to connect to an inert gas supply device. After the battery cell 100 is placed into the receiving cavity 111 and the sealing cover 12 is placed on the opening 112, the vacuum device is activated. The vacuum device can extract the air and evaporated water vapor in the receiving cavity 111, creating a low-pressure environment, which lowers the boiling point of water and allows for rapid evaporation of water at a lower temperature. It also avoids damage to the battery cell 100 materials (such as electrode active materials and separators) caused by high temperatures. After vacuuming is completed, inert gas is introduced into the containment cavity 111 through the second pipe joint 62 and the inert gas supply device. The inert gas can prevent the battery cell 100 from oxidizing due to high temperature during the drying process. Moreover, the inert gas can flow through the surface of the battery cell 100 and the vicinity of the liquid injection hole 101, carrying away the trace amount of water vapor that was not extracted by the vacuum, further reducing the residual moisture.

[0050] In some embodiments of this application, the drying equipment further includes a gas pressure sensor 7, which includes a connection end and a test end. The connection end is connected to the housing 11, and the test end is located in the receiving cavity 111. The pressure sensor monitors the gas pressure state within the receiving cavity 111 in real time, providing a basis for precise control of vacuum extraction and inert gas filling, ensuring the stability of the drying environment. By controlling the gas pressure and temperature within the receiving cavity 111, optimal environmental conditions for moisture evaporation can be created, which is beneficial for improving drying efficiency.

[0051] In summary, the drying equipment of this application includes a drying chamber 1 and a detection mechanism 2. The drying chamber 1 includes a chamber body 11 and a sealing cover 12. The chamber body 11 has a receiving cavity 111 and a chamber opening 112. The chamber opening 112 is used for the battery cell 100 to enter the receiving cavity 111, and the sealing cover 12 seals the chamber opening 112. The detection mechanism 2 includes a first driving device 21 and a humidity sensor 22. The humidity sensor 22 is disposed in the receiving cavity 111, and the first driving device 21 connects the humidity sensor 22 and the chamber body 11. During the drying process, the first driving device 21 drives the temperature sensor 5 to move towards the liquid injection hole 101, thereby causing the humidity sensor to move towards the liquid injection hole 101. 22 moves to a position closer to the injection hole 101, so that the humidity sensor 22 can detect the humidity of the gas flowing out of the injection hole 101 in a timely manner. After the test value of the humidity sensor 22 reaches the set range, it indicates that the battery cell 100 has been dried. Then, the first driving device 21 drives the temperature sensor 5 to move to a position away from the injection hole 101, so that the humidity sensor 22 is farther away from the battery cell 100, making it easier to move the dried battery cell 100 out of the box opening 112 to the outside of the receiving cavity 111, and move the undried battery cell 100 into the receiving cavity 111 from the box opening 112. The drying equipment of this application achieves convenient positioning and efficient heating of the battery cell 100 through the setting of positioning plate 32, tray 31 and bottom support plate 311. Through the setting of temperature sensor 5, gas pressure sensor 7, vacuum device and inert gas supply device, an environmental condition conducive to efficient drying of battery cell 100 is formed in the receiving cavity 111, thus achieving efficient drying of battery cell 100 and avoiding over-drying or under-drying of battery cell 100.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A drying device, characterized in that, Includes a drying oven (1) and a testing mechanism (2); The drying box (1) includes a box body (11) and a sealing cover (12). The box body (11) has a receiving cavity (111) and a box opening (112). The box opening (112) is used for battery cells (100) to enter the receiving cavity (111). The sealing cover (12) covers the box opening (112). The detection mechanism (2) includes a first driving device (21) and a humidity sensor (22). The first driving device (21) is located in the housing (11), and the humidity sensor (22) is located in the receiving cavity (111). The first driving device (21) is connected to the humidity sensor (22). The first driving device (21) is configured to drive the humidity sensor (22) to move closer to or further away from the liquid injection hole (101) of the battery cell (100).

2. The drying equipment according to claim 1, characterized in that, The drying equipment has a first direction (Z) and a second direction (X) arranged vertically; the drying equipment also includes a material tray (3) for setting multiple battery cells (100), and a box opening (112) is set on one side of the box body (11) in the second direction (X), and the box opening (112) is used to allow the material tray (3) to enter the receiving cavity (111); The humidity sensor (22) has a detection head (221) in the first direction (Z), at least a portion of which is opposite to at least a portion of one of the injection holes (101), and the first drive device (21) is configured to drive the humidity sensor (22) toward or away from the injection hole (101) in the first direction (Z).

3. The drying equipment according to claim 2, characterized in that, The tray (3) includes a pallet (31) and a positioning plate (32). The pallet (31) includes a bottom support plate (311) and a side circumference member (312) disposed around the bottom support plate (311). The bottom support plate (311) and the side circumference member (312) form a receiving groove (313), and the positioning plate (32) is disposed in the receiving groove (313). The positioning plate (32) has a plurality of positioning spaces (321), and at least a portion of a battery cell (100) is accommodated in one of the positioning spaces (321).

4. The drying equipment according to claim 3, characterized in that, The positioning space (321) is a positioning hole that passes through the positioning plate (32) along the first direction (Z), and the battery cell (100) abuts against the bottom support plate (311) on one side in the first direction (Z). The base plate (311) is a heat-conducting plate, and an electric heating wire is embedded in the base plate (311).

5. The drying equipment according to claim 2, characterized in that, The box body (11) includes a first plate (113), a second plate (114), and a side panel (115); in the first direction (Z), one side of the side panel (115) is connected to the first plate (113), and the other side is connected to the second plate (114). The first plate (113), the second plate (114), and the side panel (115) enclose the receiving cavity (111), and the box opening (112) is located on one side of the side panel (115) in the second direction (X). The first driving device (21) is a telescopic device. In the first direction (Z), one side of the telescopic device is connected to the first plate (113), and the other side is connected to the humidity sensor (22); the battery cell (100) is disposed on the second plate (114).

6. The drying equipment according to claim 2, characterized in that, The drying equipment also has a third direction (Y), and the first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other; The drying equipment further includes a first sliding member (81), a first connecting rod (82), and a second driving device (83). The first sliding member (81), the first connecting rod (82), and the second driving device (83) are disposed on the same side of the housing (11) in the third direction (Y). The first sliding member (81) is slidably connected to the housing (11) along the second direction (X). The first connecting rod (82) is rotatably connected to the first sliding member (81). The sealing cover (12) is connected to the end of the first connecting rod (82) away from the first sliding member (81). The second driving device (83) is configured to drive the first sliding member (81) to move away from the box opening (112) along the second direction (X), so that the first connecting rod (82) drives the sealing cover (12) to press against the outer periphery of the box opening (112). The second driving device (83) is also configured to drive the first sliding member (81) to move closer to the box opening (112) along the second direction (X), so that the first connecting rod (82) drives the sealing cover (12) to disengage from the outer periphery of the box opening (112).

7. The drying equipment according to claim 1, characterized in that, The drying equipment has a first direction (Z) and a second direction (X) arranged vertically; the first direction (Z) is the up-down direction; the box (11) includes a first plate (113), a second plate (114) and a side panel (115), the first plate (113), the second plate (114) and the side panel (115) enclose the receiving cavity (111), the first plate (113) is located at the top of the box (11) and the second plate (114) is located at the bottom of the box (11); The drying equipment includes a weighing sensor (4) and a material tray (3). The weighing sensor (4) is disposed on the second plate (114), and the material tray (3) is disposed on the weighing sensor (4). The material tray (3) is used to hold the battery cell (100).

8. The drying equipment according to claim 1, characterized in that, The drying equipment also includes a temperature sensor (5), which is located in the receiving cavity (111) and is connected to one end of the driving device (21) near the liquid injection hole (101).

9. The drying equipment according to claim 1, characterized in that, The drying equipment also includes a first pipe connector (61) and a second pipe connector (62), both of which are connected to the housing (11). The first pipe connector (61) is used to connect to a vacuum device, and the second pipe connector (62) is used to connect to an inert gas supply device.

10. The drying equipment according to claim 9, characterized in that, The drying equipment also includes a gas pressure sensor (7), which includes a connection end and a test end. The connection end is connected to the housing (11), and the test end is located in the receiving cavity (111).

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