A battery cell hot-pressing effect testing device

Abstract

This utility model relates to the field of battery testing technology, and in particular to a battery cell hot-pressing effect testing device, including a hot-pressing chamber, a controller, a protective door, heat insulation cotton, pressure plates, and an electric push rod. The controller is installed on the front left side of the hot-pressing chamber. A protective door is slidably installed on the front side of the hot-pressing chamber. Heat insulation cotton is attached to the inner wall of the hot-pressing chamber. Two pressure plates are arranged vertically aligned in the middle of the hot-pressing chamber; the upper pressure plate is fixed, while the lower pressure plate is slidably installed. An electric push rod is installed at the bottom of the hot-pressing chamber, and the telescopic end of the electric push rod is connected to the lower pressure plate. This utility model, by integrating components such as a deformation monitor and a pressure sensor, can monitor the thickness change and compression behavior of the battery cell in real time and continuously. The controller collects this multi-dimensional data, overcoming the limitation of traditional equipment that can only perform static pressing, and achieving full-process visual monitoring of the hot-pressing process.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a battery cell hot-pressing effect testing device. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, the hot pressing process of the cell is a key step to ensure tight bonding between cell layers, improve energy density, reduce internal resistance and improve cycle life. This process involves placing the cell between upper and lower heating plates, applying vertical pressure at a set temperature and continuing for a certain period of time to eliminate air gaps between the electrode and the separator, thereby improving the tightness of the interlayer bonding.

[0003] In existing technologies, conventional hot pressing devices typically only have basic heating and pressurization functions. By setting fixed temperature and pressure parameters, the battery cell is statically pressed. This method makes it difficult to monitor and evaluate the internal structural evolution of the battery cell under thermo-mechanical coupling in real time, and it is impossible to obtain its multi-dimensional physical response during the hot pressing process. As a result, the evaluation of the hot pressing effect remains at the level of "result verification" and lacks process data support.

[0004] Therefore, it is necessary to design a device for testing the thermal pressing effect of battery cells. Utility Model Content

[0005] In order to overcome the shortcomings of existing hot pressing devices that cannot monitor the changes in the physical properties of the battery cell in real time during the hot pressing process, this utility model provides a battery cell hot pressing effect testing device.

[0006] A battery cell hot-pressing effect testing device includes a hot-pressing chamber, a controller, a protective door, heat insulation cotton, pressure plates, an electric push rod, a central clamping structure, a heating rod, a deformation monitor, a pressure sensor, and an infrared thermometer. The controller is installed on the left front side of the hot-pressing chamber. A protective door is slidably installed on the front side of the hot-pressing chamber. Heat insulation cotton is lined around the inner wall of the hot-pressing chamber. Two pressure plates, aligned vertically, are located in the center of the hot-pressing chamber; the upper pressure plate is fixed, while the lower pressure plate is slidably installed. The lower part of the hot-pressing chamber... An electric push rod is installed, with its telescopic end connected to the lower pressure plate. The lower pressure plate has a centrally clamping structure. Both pressure plates contain multiple heating rods. A deformation monitor is installed on the rear side of the hot pressing chamber, located behind the pressure plate. A pressure sensor is installed on the right side of the lower pressure plate, with its force-bearing surface facing the upper pressure plate. Two infrared thermometers are installed on the left side of the hot pressing chamber. The controllers are electrically connected to the electric push rod, heating rods, deformation monitor, pressure sensor, and infrared thermometers.

[0007] Furthermore, the centrally clamping structure includes a clamping plate, a bidirectional screw, and a knob. The upper left and right sides of the lower pressure plate are slidably equipped with clamping plates, and the front of the lower pressure plate is rotatably connected to the bidirectional screw. The left and right clamping plates are threadedly connected to the left-hand and right-hand sections of the bidirectional screw, respectively, and the left and right sides of the bidirectional screw are fixedly connected with knobs.

[0008] Furthermore, it also includes a handle, a stop block, and a torsion spring. A handle is fixedly connected to the lower front side of the protective door, and a stop block is rotatably connected to the upper front side of the hot pressing chamber. In the initial state, the stop block blocks the upper side of the protective door, and a torsion spring is connected between the stop block's rotating shaft and the hot pressing chamber.

[0009] Furthermore, it also includes a pressure gauge and a pressure relief valve. A pressure gauge is installed on the upper right side of the hot pressing chamber, and a pressure relief valve is connected to the pressure gauge. The pressure gauge and the pressure relief valve are connected to the inside of the hot pressing chamber, and the controller is electrically connected to the pressure gauge and the pressure relief valve.

[0010] Furthermore, it also includes an observation window, with a transparent observation window located on the front side of the protective door.

[0011] Furthermore, the clamping plates are all made of silicon nitride ceramic.

[0012] Beneficial effects:

[0013] 1. This utility model integrates components such as deformation monitors and pressure sensors, which can monitor the thickness changes and compression behavior of the battery cell in real time and continuously. The controller collects these multi-dimensional data, breaking through the limitation of traditional equipment that can only perform static pressing, and realizing full-process visual monitoring of the hot pressing process.

[0014] 2. This utility model features a centrally located clamping structure consisting of a clamping plate, a bidirectional screw, and a knob. The clamping width can be manually adjusted to achieve rapid positioning and stable clamping of the battery cell, preventing displacement and improving testing accuracy. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the planar structure of the components of this utility model, such as the torsion spring, heat insulation cotton, and pressure plate.

[0017] Figure 3 This is a three-dimensional structural diagram of the components of this utility model, including the electric push rod, pressure gauge, and pressure relief valve.

[0018] Figure 4 This is a three-dimensional structural diagram of the clamping plate, bidirectional screw, and knob components of this utility model.

[0019] Reference numerals: 1_Hot pressing chamber, 2_Controller, 3_Safety door, 4_Handle, 5_Stop, 6_Torsion spring, 7_Insulation cotton, 8_Pressure plate, 9_Electric push rod, 10_Heating rod, 11_Deformation monitor, 12_Pressure sensor, 13_Infrared thermometer, 14_Pressure gauge, 15_Pressure relief valve, 16_Clamping plate, 17_Two-way screw, 18_Knob, 101_Observation window. Detailed Implementation

[0020] Example: A battery cell thermal pressing effect testing device, such as... Figures 1-4 As shown, the device includes a hot press chamber 1, a controller 2, a protective door 3, heat insulation cotton 7, pressure plates 8, an electric push rod 9, a central clamping structure, a heating rod 10, a deformation monitor 11, a pressure sensor 12, and an infrared thermometer 13. The controller 2 is installed on the front left side of the hot press chamber 1. The protective door 3 is slidably installed on the front side of the hot press chamber 1. Heat insulation cotton 7 is attached to the inner walls of the hot press chamber 1. Two pressure plates 8 are arranged vertically aligned in the middle of the hot press chamber 1. The upper pressure plate 8 is fixedly installed on the inner top of the hot press chamber 1, and the lower pressure plate 8 is slidably installed between two guide rods inside the hot press chamber 1. The lower part of the hot press chamber 1... An electric push rod 9 is installed by bolts. The telescopic end of the electric push rod 9 is connected to the lower pressure plate 8. The lower pressure plate 8 is provided with a central clamping structure. Multiple heating rods 10 are provided inside both pressure plates 8. A deformation monitor 11 is installed on the rear side of the hot pressing chamber 1. The deformation monitor 11 is located on the rear side of the pressure plate 8. A pressure sensor 12 is installed on the right side of the lower pressure plate 8. The force-bearing surface of the pressure sensor 12 faces the upper pressure plate 8. Two infrared thermometers 13 are installed on the left side of the hot pressing chamber 1. The controller 2 is electrically connected to the electric push rod 9, heating rods 10, deformation monitor 11, pressure sensor 12 and infrared thermometers 13.

[0021] like Figure 2 , Figure 3 and Figure 4 As shown, the centrally located clamping structure includes a clamping plate 16, a bidirectional screw 17, and a knob 18. The clamping plates 16 are slidably provided on both the left and right sides of the upper part of the lower pressure plate 8. The clamping plates 16 are all made of silicon nitride ceramic, which can withstand high temperature, is insulating, and does not deform. At the same time, it can also effectively protect the edge of the battery cell and avoid clamping damage. It is suitable for the testing needs of battery cells of different sizes. The bidirectional screw 17 is rotatably connected to the front of the lower pressure plate 8. The left and right clamping plates 16 are threadedly connected to the left-hand and right-hand sections of the bidirectional screw 17, respectively. The knobs 18 are fixed on both the left and right sides of the bidirectional screw 17.

[0022] like Figure 1 and Figure 2As shown, it also includes a handle 4, a stop block 5 and a torsion spring 6. The handle 4 is fixedly connected to the lower front side of the protective door 3. The stop block 5 is rotatably connected to the upper front side of the hot pressing chamber 1. In the initial state, the stop block 5 blocks the upper side of the protective door 3, and the torsion spring 6 is connected between the rotating shaft of the stop block 5 and the hot pressing chamber 1.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, it also includes a pressure gauge 14 and a pressure relief valve 15. The pressure gauge 14 is installed on the upper right side of the hot press chamber 1, and the pressure relief valve 15 is connected to the pressure gauge 14. The pressure gauge 14 and the pressure relief valve 15 are connected to the inside of the hot press chamber 1, and the controller 2 is electrically connected to the pressure gauge 14 and the pressure relief valve 15. It can monitor the pressure inside the chamber in real time, automatically relieve pressure in case of abnormality, prevent overpressure risk, and form a multi-safety protection mechanism with the protective door 3.

[0024] like Figure 1 As shown, it also includes an observation window 101. A transparent observation window 101 is provided on the front side of the protective door 3, which makes it convenient for operators to observe the internal test status in real time, thereby improving the convenience and safety of operation.

[0025] In actual use, the operator first rotates the stop block 5 to the left or right to overcome the elastic force of the torsion spring 6 and move it away from the top of the protective door 3 to release the lock on the protective door 3. Then, the operator lifts the protective door 3 vertically upward through the handle 4 on the front side of the protective door 3 and opens it along the slide rail on the front side of the hot pressing chamber 1 to expose the internal working area. Next, the battery cell to be tested is placed horizontally between the central clamping structures of the lower pressure plate 8. Then, the operator manually rotates the knobs 18 on both sides to drive the bidirectional screw 17 to rotate, so that the two clamping plates 16 on the left and right sides slide inward synchronously on the lower pressure plate 8, stably clamping and precisely centering the battery cell from both sides, preventing the battery cell from shifting or being subjected to uneven force during the hot pressing process. The clamping plates 16 are made of silicon nitride ceramic, which has excellent high temperature resistance, insulation and low thermal expansion performance, avoiding deformation or electrochemical reaction with the battery cell in high temperature environment.

[0026] After loading is completed, the protective door 3 is closed vertically downwards by the handle 4. Then, the stop block 5 is released, and the elastic force of the torsion spring 6 drives the stop block 5 to rotate automatically and block the upper edge of the protective door 3 again, realizing the automatic locking of the door and ensuring that the hot pressing process is carried out in a closed and safe environment. The protective door 3 is provided with a transparent observation window 101 on the front side, allowing the operator to observe the internal state of the cavity from the outside in real time. Then, the controller 2 controls multiple heating rods 10 to be energized to heat the upper and lower pressure plates 8 to raise their temperature to the set process temperature. The infrared thermometer 13 monitors the surface temperature of the pressure plate 8 in real time and feeds the data back to the controller 2 to realize precise closed-loop temperature control. When the temperature reaches the set value and stabilizes, the controller 2 drives the electric push rod 9 to move, pushing the lower pressure plate 8 upwards, causing the battery cell to contact the upper fixed pressure plate 8 and apply vertical pressure.

[0027] Pressure sensor 12 is installed on the right side of the lower pressure plate 8, with its force-bearing surface facing the upper pressure plate 8. During the pressurization process, pressure sensor 12 detects the pressure applied by the lower pressure plate 8 in real time and converts the sensed pressure into an electrical signal, which is transmitted to controller 2 in real time to achieve accurate monitoring and automatic adjustment of pressure, ensuring that the pressure is always kept within the set range. At the same time, during the coupling of heat and force, deformation monitor 11 monitors the thickness change of the battery cell under pressure in real time, records its compression amount, rebound behavior and interlayer densification process, and obtains the dynamic deformation curve of the battery cell during the hot pressing process. Meanwhile, controller 2 synchronously collects and records multi-dimensional data from pressure sensor 12, infrared thermometer 13 and deformation monitor 11 to form a complete response diagram, which comprehensively reflects the evolution of the physical characteristics of the battery cell during the hot pressing process. This is used to evaluate the impact of different hot pressing parameters on the compression behavior, interface adhesion and structural stability of the battery cell, and to provide a scientific basis for optimizing the mass production process.

[0028] After the test is completed, the electric push rod 9 retracts, the pressure is released, the heating rod 10 is de-energized, and the system enters the cooling stage. When the internal pressure of the cavity rises abnormally, the pressure gauge 14 transmits the signal to the controller 2, and the controller 2 automatically opens the pressure relief valve 15 to safely relieve pressure and ensure the safety of equipment and personnel. After the temperature drops to a safe range, the protective door 3 can be reopened to remove the battery cell.

Claims

1. A battery cell thermal pressing effect testing device, characterized in that: The device includes a hot press chamber (1), a controller (2), a protective door (3), heat insulation cotton (7), a pressure plate (8), an electric push rod (9), a central clamping structure, a heating rod (10), a deformation monitor (11), a pressure sensor (12), and an infrared thermometer (13). The controller (2) is installed on the left side of the front of the hot press chamber (1). The protective door (3) is installed on the front side of the hot press chamber (1) in a sliding manner. Heat insulation cotton (7) is attached to the inner wall of the hot press chamber (1). Two pressure plates (8) are arranged vertically in the middle of the hot press chamber (1). The upper pressure plate (8) is fixedly installed, and the lower pressure plate (8) is slidably installed. An electric push rod (9) is installed at the bottom of the hot press chamber (1). The telescopic end of the electric push rod (9) is connected to the lower pressure plate (8), and the lower pressure plate (8) is provided with a central clamping structure. Both pressure plates (8) are provided with multiple heating rods (10). A deformation monitor (11) is installed on the rear side of the hot pressing cavity (1). The deformation monitor (11) is located on the rear side of the pressure plate (8). A pressure sensor (12) is installed on the right side of the lower pressure plate (8). The force-bearing surface of the pressure sensor (12) faces the upper pressure plate (8). Two infrared thermometers (13) are installed on the left side of the hot pressing cavity (1). The controller (2) is electrically connected to the electric push rod (9), heating rods (10), deformation monitor (11), pressure sensor (12) and infrared thermometers (13).

2. The cell hot-pressing effect testing device according to claim 1, characterized in that: The central clamping structure includes a clamping plate (16), a bidirectional screw (17), and a knob (18). The upper left and right sides of the lower pressure plate (8) are slidably equipped with clamping plates (16), and the front of the lower pressure plate (8) is rotatably connected to the bidirectional screw (17). The left and right clamping plates (16) are threadedly connected to the left and right sections of the bidirectional screw (17), respectively. The left and right sides of the bidirectional screw (17) are fixedly connected with knobs (18).

3. The cell hot press effect testing apparatus of claim 2, wherein: It also includes a handle (4), a stop (5) and a torsion spring (6). The handle (4) is fixed to the lower front side of the protective door (3). The stop (5) is rotatably connected to the upper front side of the hot pressing chamber (1). In the initial state, the stop (5) blocks the upper side of the protective door (3), and the torsion spring (6) is connected between the rotating shaft of the stop (5) and the hot pressing chamber (1).

4. The cell hot press effect testing apparatus of claim 3, wherein: It also includes a pressure gauge (14) and a pressure relief valve (15). A pressure gauge (14) is installed on the upper right side of the hot press chamber (1). A pressure relief valve (15) is connected to the pressure gauge (14). The pressure gauge (14) and the pressure relief valve (15) are connected to the inside of the hot press chamber (1). The controller (2) is electrically connected to the pressure gauge (14) and the pressure relief valve (15).

5. The cell hot press effect testing apparatus of claim 4, wherein: It also includes an observation window (101), and a transparent observation window (101) is provided on the front side of the protective door (3).

6. The cell hot press effect testing apparatus of claim 5, wherein: The clamping plates (16) are all made of silicon nitride ceramic.

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