Packaging structure for preventing sol gel bubbles from lithium battery
By combining fixtures, end caps, thermal imaging detectors, and pressure sensors, the problem of sol bubbles in the lithium battery encapsulation process was solved, achieving efficient sealing and improved safety of lithium batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU EVE UNITED ENERGY CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-06-05
AI Technical Summary
The existing lithium battery packaging process is prone to generating sol bubbles, which affects the battery's sealing and safety, and the existing degassing sealing method cannot effectively prevent or avoid the generation of bubbles.
Using fixtures, left and right end caps, along with thermal imaging detectors and pressure sensors, the packaging uniformity is ensured through temperature and pressure detection. A PLC controller and display provide real-time monitoring and alarms, enabling real-time detection and adjustment of temperature and pressure distribution during the lithium battery packaging process.
It effectively prevents the generation of sol bubbles during lithium battery packaging, improves battery sealing, reduces electrolyte leakage and short circuit risks, and ensures battery safety and lifespan.
Smart Images
Figure CN224328717U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery processing technology, and in particular to an encapsulation structure that prevents the formation of sol bubbles in lithium batteries. Background Technology
[0002] In the production of pouch lithium batteries, electrolyte is injected into the cell, and then the aluminum-plastic film of the cell is sealed. Currently, lithium batteries are generally sealed manually or automatically after electrolyte injection. However, both manual and automatic sealing are carried out at normal atmospheric pressure. However, injecting electrolyte at atmospheric pressure easily generates air bubbles within the cell. These bubbles can remain permanently inside the cell, affecting the battery's electrical performance and degrading its quality if not removed. Therefore, a vacuum sealing process is used to effectively expel these gases and ensure sufficient internal reaction within the cell.
[0003] However, existing vacuum sealing production methods cannot prevent or avoid the generation of molten adhesive bubbles. Molten adhesive bubbles are mainly caused by improper temperature control, uneven pressure distribution, and insufficient cleanliness of material surfaces during the encapsulation process. These bubbles not only reduce the battery's sealing performance but may also cause safety hazards such as electrolyte leakage, short circuits, and reduced cell lifespan. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a packaging structure that prevents the formation of sol bubbles in lithium batteries.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] An encapsulation structure for preventing sol bubbles in lithium batteries includes: a clamp, a battery cell fixed on the clamp, and a left end cap and a right end cap located on both sides of the battery cell, wherein the left end cap and the right end cap have an encapsulation surface facing each other, and a thermal imaging detector is provided above the battery cell for detecting the temperature of the encapsulated battery cell.
[0007] In one embodiment, a lifting cylinder is provided below the clamp for controlling the lifting and lowering of the clamp, and the lifting cylinder is used to drive the clamp to lift and lower the battery cell.
[0008] In one embodiment, the thermal imaging detector is equipped with a temperature monitoring probe and an alarm. The temperature monitoring probe is used to detect the temperature of the packaging area of the battery cell, and the alarm is used to provide an alarm reminder during the temperature measurement process.
[0009] In one embodiment, the sidewall of the fixture is provided with a PLC controller, the thermal imaging detector is electrically connected to the PLC controller, and the PLC controller includes a first data processor configured to acquire and process temperature data from the thermal imaging detector.
[0010] In one embodiment, a display is provided on one side of the PLC controller, the PLC controller is electrically connected to the display, and the display is used to receive and display the temperature distribution of the cell packaging area.
[0011] In one embodiment, there are two thermal imaging detectors, which are located on both sides of the aluminum-plastic film of the battery cell, and both thermal imaging detectors are electrically connected to the PLC controller.
[0012] In one embodiment, the thermal imaging detector includes a plurality of temperature monitoring probes distributed according to the packaging area of the battery cell.
[0013] In one embodiment, pressure sensors are provided on the side of the left end cap and the right end cap facing the aluminum-plastic film. The two pressure sensors are respectively located on the side of the left end cap and the right end cap. The ends of the two pressure sensors away from the aluminum-plastic film are provided with telescopic members. The telescopic members can control the pressure sensors to move towards the aluminum-plastic film to detect the pressure of the aluminum-plastic film.
[0014] In one embodiment, a second data processor is provided on both the left end cap and the right end cap. The second data processor is electrically connected to the pressure sensor and is configured to collect and process the pressure value detected by the pressure sensor. The second data processor is also electrically connected to the display.
[0015] Compared with the prior art, the present invention has at least the following advantages:
[0016] 1. This utility model discloses a packaging structure for preventing sol bubbles in lithium batteries. The battery cell is packaged using left and right sealing heads. After the cell is initially sealed, the left and right sealing heads move away from the cell. A lifting cylinder pushes a clamp to raise the cell to a thermal imaging detector, allowing the detector to inspect the sealing area. The thermal imaging detector uses a temperature probe to check the uniformity of the temperature distribution in the sealing area and processes the temperature information via a PLC controller, transmitting it to a display. If the cell temperature distribution is uniform, it indicates the absence of sol bubbles in the aluminum-plastic film. If the temperature distribution is uneven, it indicates the potential presence of sol bubbles, requiring screening or secondary sealing. An alarm is triggered to ensure the sealing effect of the aluminum-plastic film.
[0017] 2. The encapsulation structure of this utility model for preventing sol bubbles in lithium batteries detects the pressure of the aluminum-plastic film before cell encapsulation to observe whether there is uneven pressure distribution. When the pressure is found to be uniform, the cell encapsulation area is sealed by the left and right sealing heads. After sealing, the temperature of the encapsulation area is detected by a thermal imaging detector to ensure the sealing effect of the aluminum-plastic film. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.
[0019] Figure 1 A schematic diagram of an encapsulation structure for preventing sol bubbles in lithium batteries provided by this utility model;
[0020] Figure 2 This is a schematic diagram of the thermal imaging detector in the encapsulation structure for preventing sol bubbles in lithium batteries provided by this utility model.
[0021] Figure descriptions: 10. Fixture; 20. Battery cell; 21. Aluminum-plastic film; 30. Left end cap; 40. Right end cap; 50. Thermal imaging detector; 51. Temperature monitoring probe; 52. Alarm; 60. Lifting cylinder; 70. PLC controller; 80. Display; 90. Pressure sensor; 100. Telescopic component; 110. Second data processor. Detailed Implementation
[0022] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.
[0023] An encapsulation structure to prevent sol bubbles from forming in lithium batteries, as described above. Figure 1The device includes a clamp 10, a battery cell 20 fixed to the clamp 10, and a left end cap 30 and a right end cap 40 located on both sides of the battery cell 20. The left end cap 30 and the right end cap 40 have encapsulation surfaces facing each other. When encapsulating the battery cell 20, the battery cell 20 is placed on the clamp 10, and the encapsulation surfaces of the left end cap 30 and the right end cap 40 are brought closer together to encapsulate the aluminum-plastic film 21 on the battery cell 20. A thermal imaging detector 50 is provided above the battery cell 20 for temperature detection after encapsulation. It should be noted that the ends of the left end cap 30 and the right end cap 40 that are far apart from each other are provided with driving components. In this embodiment, the driving component is a cylinder. Driving the left end cap 30 and the right end cap 40 to encapsulate the aluminum-plastic film 21 using cylinders is existing technology and will not be elaborated further here. The thermal imaging detector 50 is fixed above the battery cell 20 by a bracket, which is not shown in the figure.
[0024] Reference Figure 1 Below the clamp 10 is a lifting cylinder 60 for controlling the lifting and lowering of the clamp 10. The lifting cylinder 60 is used to drive the clamp 10 to lift and lower the battery cell 20. After the battery cell 20 is degassed and sealed, the left end cap 30 and the right end cap 40 move away from the end of the battery cell 20. The lifting cylinder 60 pushes the clamp 10 to lift the battery cell 20 to the thermal imaging detector 50 so that the thermal imaging detector 50 can detect the sealing area of the battery cell 20 and detect whether the temperature distribution of the sealing area of the battery cell 20 is uniform. If the temperature distribution of the battery cell 20 is uniform, it means that there are no air bubbles in the aluminum-plastic film 21. If the temperature distribution of the battery cell 20 is uneven, it means that the battery cell 20 may have poor sealing effect or air bubbles in the aluminum-plastic film 21, and needs to be screened.
[0025] Furthermore, referring to Figure 1 and Figure 2 The thermal imaging detector 50 is equipped with a temperature monitoring probe 51 and an alarm 52. The temperature monitoring probe 51 is used to detect the temperature of the battery cell 20 packaging area, and the alarm 52 is used to provide an alarm reminder during the temperature measurement process.
[0026] Reference Figure 1 A PLC controller 70 is provided on the side wall of the fixture 10. The thermal imaging detector 50 is electrically connected to the PLC controller 70. The PLC controller 70 includes a first data processor, which is configured to collect and process the temperature data from the thermal imaging detector 50. Under the program set by the first data processor, the PLC controller 70 compares the temperature at various locations in the battery cell 20 packaging area to determine whether the temperature distribution in the battery cell 20 packaging area is uniform. In case of uneven temperature distribution, the PLC controller 70 controls the alarm 52 to issue an alarm.
[0027] Furthermore, referring to Figure 1A display 80 is provided on one side of the PLC controller 70. The PLC controller 70 and the display 80 are electrically connected. The PLC controller 70 and the display 80 can be connected via wired or wireless connection. In this embodiment, the display 80 is used to receive and display the temperature distribution of the battery cell 20 packaging area, so that the PLC controller 70 can transmit the temperature data of the battery cell 20 packaging area to the display 80 for display, thereby making it convenient for the operator to clearly understand the temperature distribution of the battery cell 20 packaging area. It should be noted that the display 80 is an LCD screen.
[0028] Furthermore, referring to Figure 1 and Figure 2 There are two thermal imaging detectors 50, one on each side of the aluminum-plastic film 21, one at the left end cap 30 and one at the right end cap 40, to comprehensively monitor the temperature of the encapsulation area of the battery cell 20. Both thermal imaging detectors 50 are electrically connected to the PLC controller 70. When the alarm 52 of either thermal imaging detector 50 sounds, it indicates that the temperature distribution in the encapsulation area of the battery cell 20 is uneven, and it is judged as NG (Not Good). Manual screening is then performed, and the encapsulation equipment is adjusted. Battery cells 20 judged as NG can undergo secondary sealing and rework to improve the sol-gel bubble effect. It should be noted that the thermal imaging detector 50 includes multiple temperature monitoring probes 51, which are distributed according to the encapsulation area of the battery cell 20 to monitor the temperature within that area.
[0029] Reference Figure 1 In use, the left end cap 30 and the right end cap 40 encapsulate the battery cell 20. After the battery cell 20 is sealed once, the left end cap 30 and the right end cap 40 move away from the battery cell 20. The lifting cylinder 60 pushes the clamp 10 to lift the battery cell 20 to the thermal imaging detector 50 so that the thermal imaging detector 50 can detect the sealing area of the battery cell 20. The thermal imaging detector 50 detects whether the temperature distribution of the sealing area of the battery cell 20 is uniform through the temperature detection probe, and processes the temperature information through the PLC controller 70 and transmits the temperature information to the display 80 for display. If the temperature distribution of the battery cell 20 is uniform, it means that there are no sol bubbles in the aluminum-plastic film 21. If the temperature distribution of the battery cell 20 is uneven, it means that there may be sol bubbles in the aluminum-plastic film 21, and screening or secondary sealing is required. An alarm will be triggered by the alarm 52.
[0030] Furthermore, referring to Figure 1Pressure sensors 90 are provided on the sides of the left end cap 30 and right end cap 40 facing the aluminum-plastic film 21. The two pressure sensors 90 are respectively located on the sides of the left end cap 30 and right end cap 40, with their detection probes facing the aluminum-plastic film 21. A telescopic member 100 is provided at the end of each pressure sensor 90 away from the aluminum-plastic film 21. The telescopic member 100 controls the two pressure sensors 90 to move closer to the aluminum-plastic film 21, so as to contact the surface of the aluminum-plastic film 21 and detect the pressure on it. In this embodiment, the telescopic member 100 is a telescopic rod or a cylinder, and can be fixed to a device with the left end cap 30 or right end cap 40. Before the left end cap 30 and right end cap 40 encapsulate the aluminum-plastic film 21 of the battery cell 20, the pressure on both sides of the aluminum-plastic film 21 is detected by the two pressure sensors 90 to check for uneven pressure distribution.
[0031] Reference Figure 1 Both the left end cap 30 and the right end cap 40 are equipped with a second data processor 110. The second data processor 110 is electrically connected to the pressure sensor 90. The second data processor 110 is configured to collect and process the pressure value detected by the pressure sensor 90, thereby obtaining the pressure value of the aluminum-plastic film 21. It should be noted that the second data processor 110 is electrically connected to the display 80. The second data processor 110 and the display 80 can be connected by wired or wireless means. In this embodiment, the display 80 is used to receive and display the pressure distribution of the battery cell 20 packaging area, so that the second data processor 110 can transmit the pressure data of the battery cell 20 packaging area to the display 80 for display. This allows the operator to clearly understand the pressure distribution of the battery cell 20 packaging area, thereby ensuring that the packaging operation is performed when the pressure distribution of the aluminum-plastic film 21 is uniform.
[0032] This invention detects the pressure of the aluminum-plastic film 21 before the battery cell 20 is packaged to observe whether there is uneven pressure distribution. When the pressure is uniform, the left and right sealing heads 30 and 40 seal the packaging area of the battery cell 20. After sealing, the left and right sealing heads 30 and 40 retract, causing the lifting cylinder 60 to lift the battery cell 20. This allows the thermal imaging detector 50 to detect the temperature of the packaging area of the battery cell 20. The sealing effect of the aluminum-plastic film 21 is detected by the temperature distribution of the packaging area. If the temperature is uniform, the battery cell can be transported to the next process. If the temperature is uneven, an alarm is triggered and a second sealing operation is performed to improve the molten adhesive bubbles and ensure the sealing effect of the aluminum-plastic film 21.
[0033] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A packaging structure for preventing the formation of sol bubbles in lithium batteries, characterized in that, include: The device includes a clamp (10), a battery cell (20) fixed on the clamp (10), and a left end cap (30) and a right end cap (40) located on both sides of the battery cell (20). The left end cap (30) and the right end cap (40) have a packaging surface facing each other. A thermal imaging detector (50) is provided above the battery cell (20) for detecting the temperature of the packaged battery cell (20).
2. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 1, characterized in that, Below the clamp (10) is a lifting cylinder (60) for controlling the lifting of the clamp (10). The lifting cylinder (60) is used to drive the clamp (10) to lift the battery cell (20).
3. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 1, characterized in that, The thermal imaging detector (50) is equipped with a temperature monitoring probe (51) and an alarm (52). The temperature monitoring probe (51) is used to detect the temperature of the encapsulation area of the battery cell (20), and the alarm (52) is used to provide an alarm reminder during the temperature measurement process.
4. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 3, characterized in that, The side wall of the fixture (10) is provided with a PLC controller (70), and the thermal imaging detector (50) is electrically connected to the PLC controller (70). The PLC controller (70) includes a first data processor, which is configured to collect and process the temperature data of the thermal imaging detector (50).
5. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 4, characterized in that, A display (80) is provided on one side of the PLC controller (70). The PLC controller (70) is electrically connected to the display (80). The display (80) is used to receive and display the temperature distribution of the battery cell (20) packaging area.
6. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 5, characterized in that, There are two thermal imaging detectors (50), which are located on both sides of the aluminum-plastic film (21) of the battery cell (20) and are electrically connected to the PLC controller (70).
7. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 6, characterized in that, The thermal imaging detector (50) includes a plurality of temperature monitoring probes (51), which are distributed according to the packaging area of the battery cell (20).
8. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 5, characterized in that, Pressure sensors (90) are provided on the side of the left end cap (30) and the right end cap (40) facing the aluminum-plastic film (21). The two pressure sensors (90) are respectively located on the side of the left end cap (30) and the right end cap (40). The ends of the two pressure sensors (90) away from the aluminum-plastic film (21) are provided with telescopic members (100). The telescopic members (100) can control the pressure sensors (90) to move towards the aluminum-plastic film (21) to detect the pressure of the aluminum-plastic film (21).
9. The encapsulation structure for preventing sol bubbles in lithium batteries according to claim 8, characterized in that, Both the left end cap (30) and the right end cap (40) are provided with a second data processor (110). The second data processor (110) is electrically connected to the pressure sensor (90). The second data processor (110) is configured to collect and process the pressure value detected by the pressure sensor (90). The second data processor (110) is also electrically connected to the display (80).