A pressurization mechanism for an airbag pressurized battery cell

Abstract

This utility model relates to the field of battery cell hot-pressing formation technology, specifically to a pressurizing mechanism for an airbag-pressurized battery cell. The mechanism includes a base, a battery cell placement assembly and a drive assembly on the base, and an airbag pressurizing assembly connected to the drive assembly. The airbag pressurizing assembly includes a cavity plate, a contour plate, and an airbag sheet. The cavity plate has an air inlet cavity on the side facing the contour plate, and the airbag sheet covers the outside of the air inlet cavity. The contour plate has a contoured opening adapted to the shape of the battery cell. The airbag pressurizing assembly also includes an inflation / deflation device to input gas into the air inlet cavity when the airbag pressurizing assembly approaches the battery cell placement assembly, causing the airbag sheet to inflate and apply pressure to the battery cell on the battery cell placement assembly through the contoured opening. The airbag sheet acts directly on the surface of the battery cell. Due to the flexible deformation characteristics of the airbag sheet, even if the surface of the battery cell is uneven, the airbag sheet can still adaptively conform, ensuring uniform pressure distribution on the stressed surface.

Description

Technical Field

[0001] This utility model relates to the field of battery cell hot pressing formation technology, specifically to a pressurizing mechanism for an airbag pressurized battery cell. Background Technology

[0002] With the iteration of traditional consumer electronics products and the continuous emergence of new consumer electronics products, the consumer lithium battery market continues to grow steadily. To enhance product competitiveness, irregularly shaped battery cells with uneven surfaces and steps have appeared on the market to make full use of space and adapt to diverse emerging electronic products. The trend of irregularly shaped battery cells places higher demands on the fixtures used in the thermo-pressing charging and discharging equipment during the production process, requiring higher and more uniform pressure control capabilities to ensure the quality of the battery cells.

[0003] Currently, most existing battery cell pressurization mechanisms use silicone pads to pressurize the battery cells. However, silicone pads have several limitations in practical applications: Firstly, when dealing with uneven areas on irregularly shaped battery cells, silicone pads cannot guarantee uniform pressure distribution, easily leading to excessive or insufficient pressure in certain areas, which in turn affects the consistency of the internal materials of the battery cell, reducing its performance and yield. Secondly, silicone pads experience elastic decay during long-term use, resulting in unstable pressure output, which cannot meet the pressure stability requirements of long-term hot-press charging and discharging processes for battery cells. Utility Model Content

[0004] In view of the above-mentioned technical problems in the existing technology, the present invention provides a pressurization mechanism for an airbag pressurized battery cell.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pressurizing mechanism for an airbag-pressurized battery cell is provided. The mechanism is characterized by comprising a base, on which a battery cell placement assembly and a driving assembly are mounted. It also includes an airbag pressurizing assembly, which is tractively connected to the driving assembly to allow it to approach or move away from the battery cell placement assembly. The airbag pressurizing assembly includes a cavity plate, a contour plate, and an airbag sheet. The airbag sheet is disposed between the cavity plate and the contour plate. An air inlet cavity is provided on the side of the cavity plate facing the contour plate, and the airbag sheet covers the outside of the air inlet cavity. A contour opening adapted to the shape of the battery cell to be pressurized is provided on the contour plate. The airbag pressurizing assembly also includes an inflation / deflation device to input gas into the air inlet cavity when the airbag pressurizing assembly approaches the battery cell placement assembly, causing the airbag sheet to inflate and apply pressure to the battery cell on the battery cell placement assembly through the contour opening.

[0007] Preferably, the edge of the airbag extends beyond the periphery of the air intake cavity, and the portion of the airbag extending beyond the periphery of the air intake cavity is sealed and fixedly connected to the cavity plate.

[0008] Preferably, the inflation / deflation device includes a gas flow pipe, on which an inlet valve and an exhaust valve are provided, and a pressure gauge for detecting gas pressure is provided between the inlet valve and the exhaust valve; it also includes an inlet pipe, which is located on the cavity plate, with one end connected to the inlet cavity and the other end connected to the gas flow pipe.

[0009] Preferably, the gas flow pipe is also equipped with a pressure regulating valve to regulate the gas pressure entering the air intake cavity.

[0010] Preferably, the battery cell placement assembly includes a placement block with a placement slot adapted to the shape of the battery cell; the battery cell placement assembly also includes a heating device, which includes a heating plate and a heating film, the heating film being attached to one side of the heating plate, and the side of the heating plate opposite to the heating film being attached to the placement block.

[0011] Preferably, the heating device further includes a heat insulation plate, which is disposed on the side of the heating film away from the heating plate, to prevent the heat generated by the heating film from being transferred to the other side.

[0012] Preferably, the cell placement assembly further includes a pressure sensor, which is located on the base. The other side of the pressure sensor is attached to the side of the heat insulation plate away from the heating film, and a pressure monitor is located on the pressure sensor or the heat insulation plate.

[0013] Preferably, the drive assembly includes a power device and a sliding device connected by a transmission. The airbag pressurization assembly is connected to the sliding device. The power device can drive the sliding device to slide, thereby causing the airbag pressurization assembly to move closer to or away from the battery cell placement assembly. The power device includes a servo motor, which is connected to a reducer. The output end of the reducer is rotatably connected to a transmission screw.

[0014] Preferably, the sliding device includes a threaded sleeve, which is threadedly connected to the transmission screw, and the threaded sleeve can move axially along the transmission screw when the screw rotates. A sliding plate is fixedly provided on the top of the threaded sleeve, and a connecting rod is provided on the sliding plate. The connecting rod is connected to the airbag pressurization assembly.

[0015] Preferably, the two ends of the skateboard are provided with sliders, and the base is provided with slide rails that slide in cooperation with the sliders.

[0016] The beneficial effects of this utility model are:

[0017] In existing technologies, when pressurizing a battery cell, pressure plates or silicone pads are usually installed on both sides of an airbag. The airbag expands to drive the pressure plates or silicone pads on both sides to move, thereby pressurizing the battery cell.

[0018] The present invention discloses a pressurizing mechanism for an airbag-pressurized battery cell. An airbag is positioned between a cavity plate and a contour plate, with a contoured opening on the contour plate adapted to the shape of the battery cell to be pressurized. When the airbag inflates, it extends directly through the contoured opening and acts directly on the surface of the battery cell. Due to the flexible deformation characteristics of the airbag, even if the surface of the battery cell is uneven, the airbag can still adaptively conform, ensuring a uniform pressure distribution on the stressed surface. Furthermore, the airbag is compatible with irregularly shaped battery cells of various regular forms. Whether it has a complex contour with uneven steps or a special irregular surface structure, the airbag can make close contact with the battery cell surface through the contoured opening, achieving effective pressurization. Attached Figure Description

[0019] Figure 1 This is a perspective view of the pressurization mechanism of an airbag pressurized battery cell in one of the embodiments.

[0020] Figure 2 This is a perspective view of another angle of the pressurization mechanism of an airbag pressurized battery cell in the embodiment.

[0021] Figure 3 This is an exploded view of the airbag pressurization assembly in the embodiment.

[0022] Figure 4 This is an exploded view of the battery cell placement assembly in the embodiment.

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0024] Figure 6 This is a perspective view of the base and drive components in the embodiment.

[0025] Figure 7 This is a perspective view of the sliding device in the embodiment.

[0026] Reference numerals: 1. Base; 10. Cell placement assembly; 100. Placement block; 101. Placement slot; 11. Heating device; 110. Heating plate; 111. Heating film; 112. Heat insulation plate; 12. Pressure sensor; 13. Drive assembly; 130. Power unit; 131. Servo motor; 132. Reducer; 133. Transmission screw; 14. Sliding device; 140. Threaded sleeve; 141. Slide plate; 142. Connecting rod; 143. Slider; 144. Slide rail; 2. Airbag pressurization assembly; 20. Cavity plate; 201. Air inlet cavity; 21. Contouring plate; 211. Contouring port; 22. Airbag sheet; 23. Inflation / depression device; 230. Gas flow pipe; 231. Inlet valve; 232. Exhaust valve; 233. Pressure gauge; 234. Pressure regulating valve; 235. Inlet pipe. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] This embodiment provides a pressurization mechanism for an airbag-pressurized battery cell, such as... Figures 1 to 7 As shown, the device includes a base 1 and an airbag pressurization assembly 2. A battery cell placement assembly 10 and a drive assembly 13 are mounted on the base 1. The drive assembly 13 is connected to the airbag pressurization assembly 2, enabling the airbag pressurization assembly 2 to move closer to or further away from the battery cell placement assembly 10 under the drive of the drive assembly 13. In use, the battery cell to be pressurized is first placed on the battery cell placement assembly 10. Then, the drive assembly 13 drives the airbag pressurization assembly 2 to move closer to the battery cell placement assembly 10. Finally, the airbag pressurization assembly 2 pressurizes the battery cell placed in the battery cell placement assembly 10.

[0029] Furthermore, the airbag pressurization assembly 2 includes a cavity plate 20 and an airbag sheet 22 disposed on one side of the cavity plate 20, with the edge of the airbag sheet 22 being sealed and fixedly connected to the cavity plate 20. An air intake cavity 201 is formed on the side of the airbag sheet 22 covering the cavity plate, and the airbag sheet 22 covers the outside of the air intake cavity 201, with the edge of the airbag sheet 22 extending beyond the periphery of the air intake cavity 201.

[0030] The airbag pressurization assembly 2 also includes a contour plate 21, which is located on the side of the cavity plate 21 where the air intake cavity 201 is opened. In other words, the airbag sheet 22 is located between the cavity plate 20 and the contour plate.

[0031] The airbag pressurization assembly 2 also includes an inflation / deflation device 23, which can input gas into the air intake chamber 201. When the gas enters the air intake chamber 201, the airbag sheet 22 covering it will expand due to the air pressure.

[0032] It is worth noting that a contoured opening 211 is provided on the contoured plate 21, which is adapted to the shape of the battery cell placed in the battery cell placement assembly 10. Therefore, when the airbag 22 inflates, it can pass through the contoured opening 211 and act directly on the surface of the battery cell, applying pressure to the battery cell on the battery cell placement assembly 10.

[0033] In this design, because the edge of the airbag 22 is sealed and fixed to the cavity plate 20, the portion connected to the cavity plate 20 is completely restricted in its expansion freedom. Only the unfixed central area can expand freely towards the contour plate 21. This allows the gas pressure entering the air intake cavity 201 to be concentrated on the area of ​​the airbag 22 facing the contour port 211, preventing the pressure from dissipating in all directions. At the same time, the constraint effect of the contour port 211 further focuses the expansion force on the surface of the battery cell, thereby applying a higher effective pressure to the battery cell under the same inflation pressure, significantly improving pressurization efficiency and pressure accuracy.

[0034] Furthermore, since the airbag 22 can directly act on the surface of the battery cell, its flexible deformation characteristics allow it to adapt and fit even on uneven surfaces, ensuring uniform pressure distribution on the cell's surface. Moreover, the airbag 22 is compatible with irregularly shaped battery cells of various regular forms. Whether the cell has a complex contour with uneven steps or a special irregular surface structure, the airbag 22 can make close contact with the cell surface through the contoured opening 211, achieving effective pressurization and significantly improving the equipment's adaptability to diverse products.

[0035] Furthermore, the inflation / deflation device 23 includes a gas flow pipe 230 and an air inlet pipe 235. The gas flow pipe 230 is equipped with an air inlet valve 231 for controlling the inflow of gas and an air outlet valve 232 for controlling the outflow of gas. The air inlet pipe 235 is located on the cavity plate 20, with one end connected to the air inlet cavity 201 and the other end connected to the gas flow pipe 230.

[0036] A pressure gauge 233 is also installed on the pipe between the intake valve 231 and the exhaust valve 232. The pressure gauge 233 can monitor the air pressure in the intake chamber 201 in real time, providing data support for pressure regulation. It should be noted that the bottom of the pressure gauge 233 is provided with an extension tube. One end of the extension tube is connected to the gas flow pipe 230, and the other end of the extension tube is connected to the intake pipe 235. The gas in the gas flow pipe 230 enters the intake chamber 201 through this extension tube.

[0037] In use, when it is necessary to inflate the air intake chamber 201, the air intake valve 231 is opened and the exhaust valve 232 is closed. Gas flows into the air intake chamber 201 through the gas flow pipe 230, the extension pipe and the air intake pipe 235, so that the airbag 22 can inflate and pass through the contoured opening 211 and press against the battery cell. When it is necessary to depressurize, the air intake valve 231 is closed and the exhaust valve 232 is opened. The gas in the air intake chamber 201 is discharged to the external environment through the air intake pipe 235, the extension pipe, the gas flow pipe 230 and the exhaust valve 232 in sequence, so that the airbag 22 contracts and returns to its original position.

[0038] In addition, a pressure regulating valve 234 is provided on the gas flow pipe 230, located upstream of the air inlet valve 231. This design allows the pressure regulating valve 234 to adjust the gas intake volume as gas passes through it, thereby regulating the gas pressure entering the air inlet chamber 201. When the pressure gauge 233 detects that the gas pressure is lower than the target value, the pressure regulating valve 234 automatically increases the intake volume; conversely, it decreases the intake volume, ensuring that the gas pressure remains stable within the preset process range. This avoids damage to the battery cell due to excessive pressure or insufficient pressure affecting the pressurization effect.

[0039] Furthermore, the cell placement assembly 10 includes a placement block 100, on which a placement slot 101 is formed. The cell to be pressurized is inserted into the placement slot 101. It should be noted that the outline and size of the placement slot 101 strictly correspond to the contour opening 211 of the contour plate 21, ensuring that after the cell is inserted into the placement slot 101, the surface to be pressurized is completely aligned with the position of the contour opening 211. When the shape of the cell changes, the matching placement block 100 and contour plate 21 need to be replaced simultaneously to ensure that the placement slot 101, the shape of the cell, and the contour opening 211 always maintain geometric consistency.

[0040] In addition, the battery cell placement assembly 10 also includes a heating device 11, which includes a heating plate 110 and a heating film 111. The heating film 111 is attached to one side of the heating plate 110, while the side of the heating plate 110 facing away from the heating film 111 is attached to the placement block 100 and is detachably connected to the placement block 100. In use, the heating film 111 can generate heat by itself. Since the heating film 111 is tightly attached to the heating plate 110, the heat is conducted to the placement block 100 through the heating plate 110, thereby heating the battery cells in the placement slot 101.

[0041] The heating device 11 also includes a heat insulation plate 112, which is disposed on the side of the heating film 111 away from the heating plate 110. That is, the heating film 111 is disposed between the heat insulation plate 112 and the heating plate 110. By providing the heat insulation plate 112, the heat insulation plate 112 can prevent the heat generated by the heating film 111 from being transferred to the other side.

[0042] In addition, the cell placement assembly 10 also includes a pressure sensor 12, with one side of the pressure sensor 12 mounted on the base 1 and the other side of the pressure sensor 12 attached to the side of the heat insulation plate 112 facing away from the heating film 111. This design ensures that when the airbag 22 inflates and applies pressure to the cell through the contour plate 211, this pressure is transmitted sequentially through the cell, the heating film 111, and the heat insulation plate 112 to the pressure sensor 12. This allows the pressure sensor 12 to detect the actual pressure on the cell, thus creating a dual monitoring mechanism between the pressure sensor 12 and the pressure gauge. This ensures simultaneous monitoring of the actual force on the cell and the pressure state within the airbag, improving the safety and reliability of the pressurization process.

[0043] Furthermore, the drive assembly 13 includes a power device 130 and a sliding device 14 connected by a transmission. The sliding device 14 is connected to the airbag pressurization assembly 2. When the power device 130 drives the sliding device 14 to slide, the sliding device 14 can drive the airbag pressurization assembly 2 to slide, so that the airbag pressurization assembly 2 can move closer to or further away from the battery cell placement assembly 10.

[0044] Specifically, the power unit 130 includes a servo motor 131, the output end of which is connected to a reducer 132, and the output end of the reducer 132 is rotatably connected to a transmission lead screw 133.

[0045] The sliding device 14 includes a threaded sleeve 140, on the inner wall of which is provided an internal thread that matches the external thread of the transmission screw 133, forming a threaded pair. When the transmission screw 133 rotates, the threaded sleeve 140 can move linearly along the axial direction of the transmission screw 133.

[0046] A slide plate 141 is fixedly installed on the top of the threaded sleeve 140. A connecting rod 142 is provided on the slide plate 141. The connecting rod 142 is connected to the contour plate 21 in the airbag pressurization assembly 2. Therefore, when the threaded sleeve 140 moves linearly along the axial direction of the transmission screw 133, the connecting rod 142 on the slide plate 141 can move the airbag pressurization assembly 2 together.

[0047] In addition, in order to keep the skateboard 141 stable during the sliding process, sliders 143 are provided at both ends of the skateboard 141, and a slide rail is provided on the base 1 to slide in cooperation with the sliders 143.

[0048] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" 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 or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A pressurizing mechanism of a gas bag pressurized battery cell, characterized by comprising: The system includes a base (1), on which a battery cell placement assembly (10) and a drive assembly (13) are mounted. It also includes an airbag pressurization assembly (2), which is connected to the drive assembly (13) to allow the airbag pressurization assembly (2) to move closer to or further away from the battery cell placement assembly (10). The airbag pressurization assembly (2) includes a cavity plate (20), a contour plate (21), and an airbag sheet (22). The airbag sheet (22) is positioned between the cavity plate (20) and the contour plate (21), with the cavity plate (20) facing the contour plate (22). 21) has an air intake cavity (201) on one side, and an airbag plate (22) covers the outside of the air intake cavity (201). The contour plate (21) has a contour opening (211) adapted to the shape of the battery cell to be pressurized. The airbag pressurization assembly (2) also includes an inflation and deflation device (23) to input gas into the air intake cavity (201) when the airbag pressurization assembly (2) is close to the battery cell placement assembly (10), so that the airbag plate (22) expands and applies pressure to the battery cell on the battery cell placement assembly (10) through the contour opening (211).

2. The pressurizing mechanism of a gas bag pressurized battery cell according to claim 1, wherein The edge of the airbag piece (22) extends beyond the periphery of the air intake cavity (201), and the part of the airbag piece (22) that extends beyond the periphery of the air intake cavity (201) is sealed and fixedly connected to the cavity plate (20).

3. The pressurization mechanism of a gas bag pressurized electric core according to claim 2, wherein The inflation / deflation device (23) includes a gas flow pipe (230), on which an inlet valve (231) and an exhaust valve (232) are provided, and a pressure gauge (233) for detecting gas pressure is provided between the inlet valve (231) and the exhaust valve (232); it also includes an inlet pipe (235), which is located on the cavity plate (20), with one end connected to the air inlet cavity (201) and the other end connected to the gas flow pipe (230).

4. The pressurization mechanism of a gas bag pressurized battery cell according to claim 3, wherein The gas flow pipe (230) is also equipped with a pressure regulating valve (234) for regulating the gas pressure entering the air intake cavity (201).

5. The pressurization mechanism of a gas bag pressurized battery cell according to claim 1, wherein The battery cell placement assembly (10) includes a placement block (100), on which a placement slot (101) adapted to the shape of the battery cell is provided; the battery cell placement assembly (10) also includes a heating device (11), which includes a heating plate (110) and a heating film (111), the heating film (111) being attached to one side of the heating plate (110), and the side of the heating plate (110) facing away from the heating film (111) being attached to the placement block (100).

6. The pressurization mechanism of a gas bag pressurized electric core according to claim 5, wherein The heating device (11) also includes a heat insulation plate (112), which is disposed on the side of the heating film (111) away from the heating plate (110) to prevent the heat generated by the heating film (111) from being transferred to the other side.

7. The pressurization mechanism of a gas bag pressurized electric core according to claim 6, wherein The cell placement assembly (10) also includes a pressure sensor (12), which is located on the base (1). The other side of the pressure sensor (12) is attached to the side of the heat insulation plate (112) away from the heating film (111).

8. The pressurization mechanism of a gas bag pressurized battery cell according to claim 1, wherein The drive assembly (13) includes a power device (130) and a sliding device (14) connected by transmission. The airbag pressurization assembly (2) is connected to the sliding device (14). The power device (130) can drive the sliding device (14) to slide, thereby driving the airbag pressurization assembly (2) to move closer to or away from the battery cell placement assembly (10). The power device (130) includes a servo motor (131). The servo motor (131) is connected to a reducer (132). The output end of the reducer (132) is rotatably connected to a transmission screw (133).

9. The pressurization mechanism of a gas bag pressurized electric core according to claim 8, wherein The sliding device (14) includes a threaded sleeve (140), which is threadedly connected to the transmission screw (133). The threaded sleeve (140) can move axially along the transmission screw (133) when the screw rotates. A sliding plate (141) is fixedly provided on the top of the threaded sleeve (140). A connecting rod (142) is provided on the sliding plate (141). The connecting rod (142) is connected to the airbag pressurization assembly (2).

10. The pressurization mechanism of the gas bag pressurized electric core according to claim 9, wherein The two ends of the slide (141) are respectively provided with sliders (143), and the base (1) is provided with a slide rail (144) that slides with the sliders (143).

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