In-situ observation device suitable for thermal stability of battery diaphragm

Abstract

The utility model relates to the field of battery diaphragm thermal stability application, in particular to an in-situ observation device suitable for battery diaphragm thermal stability, which is used for testing thermal shrinkage and thermal tensile properties of a diaphragm. The in-situ observation device comprises an amplification observation device, a windshield, a prototype diaphragm, a heating table and a microcomputer. The in-situ observation device for the thermal stability of the battery diaphragm provided by the utility model can be used for directly observing the phenomena of contraction, stretching and the like of the diaphragm after being heated without changing the shape condition of the diaphragm after being heated. Compared with the prior art, the device has the advantages of accurate measurement of the thermal stability of the diaphragm, high operation automation degree and the like.

Description

Technical Field

[0001] This utility model relates to the field of battery separator thermal stability application, specifically to an in-situ observation device for battery separator thermal stability. Background Technology

[0002] Currently, factors inducing thermal runaway in lithium-ion batteries can be categorized into three types: mechanical abuse (needle penetration, extrusion deformation, external impact), electrical abuse (overcharging, over-discharging, short circuit), and thermal abuse (thermal management system failure). Thermal runaway behavior primarily involves three critical temperatures: the abnormal heating initiation temperature (T1), the trigger temperature (T2), and the maximum temperature (T3). Generally, higher T1 and T2 temperatures indicate better thermal stability of the lithium-ion battery, while lower T3 temperatures indicate less heat release during thermal runaway. It is widely believed that as temperature increases, the battery's internal separator first contracts, causing direct contact between the positive and negative electrodes. This contact leads to a short circuit within the battery, instantly triggering a heat generation rate far exceeding the heat dissipation rate. Ultimately, the accumulated heat causes thermal runaway. Therefore, the thermal stability of the battery's internal separator directly affects the overall quality of the battery's thermal runaway behavior.

[0003] Currently, the main method for testing the thermal stability of battery separators is to place the cut separator in an oven or baking oven at a certain temperature (≥100℃) for a period of time, and then take it out to observe the shrinkage and stretching of the separator directly or using microscopic means. However, this testing method has problems such as easily changing the shape of the separator after heating, difficulty in accurately controlling the thermal stability of the separator, and low degree of automation. Therefore, it is necessary to design an in-situ observation device suitable for the thermal stability of battery separators to complete the in-situ observation of thermal stability. Utility Model Content

[0004] The purpose of this invention is to provide an in-situ observation device for the thermal stability of battery separators, so as to solve the problems mentioned in the background art.

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

[0006] An in-situ observation device for the thermal stability of battery separators includes a magnified observation device 1, a windproof cover 2, a heating platform 4, a microcomputer 5, and a transmission device;

[0007] The heating platform 4 is frustum-shaped, and the windproof cover 2 is an open cylindrical shape with a radius larger than the upper circular radius of the heating platform 4, so that the windproof cover 2 is attached to the upper part of the heating platform 4 and sealed; the windproof cover 2 is made of transparent material; the prototype diaphragm 3 to be observed is placed in the heating area of ​​the heating platform 4;

[0008] One end of the magnifying observation device 1 enters the cylindrical interior through the windproof cover 2 to observe the prototype diaphragm 3, and the other end is connected to the microcomputer 5 through a transmission device; the microcomputer 5 is used to operate the magnifying observation device 1, process the data transmitted by the magnifying observation device 1, and perform visualization display.

[0009] The connection between the magnifying observation device 1 and the windproof cover 2 is provided with vertical, front-back, and left-right sliding rails, which are used to adjust the relative position distance between the magnifying observation device 1 and the prototype diaphragm 3.

[0010] Preferably, the transmission device is a wired transmission line 7 or a wireless transmission device 8, which connects the magnified observation device 1 to the microcomputer 5.

[0011] Furthermore, the wired transmission line 7 is a USB high-definition cable with a length of 50-200cm.

[0012] Preferably, the magnifying observation device 1 is a microscope, including an optical microscope or an electron microscope.

[0013] Furthermore, the microscope is 10-20cm high and 3-8cm in diameter.

[0014] Preferably, the windproof cover 2 is a transparent glass or silicone rubber sheet with a height of 10-20cm and a diameter of 50-100cm.

[0015] Furthermore, the heating platform 4 is 60-100cm long, 20-50cm wide, and 10-20cm high, with a diameter of 40-80cm on its upper surface.

[0016] Preferably, the microcomputer 5 is a desktop computer, tablet computer, or mobile phone.

[0017] Furthermore, the microcomputer 5 is equipped with a display screen 6 to display the magnified diaphragm processed by the magnification observation device 1.

[0018] Preferably, the heating temperature range of the heating platform 4 is not less than 50 to 300°C.

[0019] The beneficial effects of this utility model are:

[0020] 1) The battery separator thermal stability in-situ observation device provided by this utility model can directly observe the phenomena such as shrinkage and stretching of the separator when heated without changing the shape of the separator after heating;

[0021] 2) Compared with existing devices, the battery separator thermal stability in-situ observation device provided by this utility model has the characteristic of accurate measurement of separator thermal stability.

[0022] 3) The device of this utility model also has the advantage of a high degree of automation in operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the layout of the in-situ observation device for the thermal stability of a battery separator, which is directly connected to a computer via a wired transmission device, according to Embodiment 1 of this utility model.

[0024] Figure 2 This is a schematic diagram of the layout of the in-situ observation device for the thermal stability of a battery separator, which is connected to a computer via a wireless transmission device, according to Embodiment 1 of this utility model.

[0025] Figure 3 This is a schematic diagram of the layout of the in-situ observation device for the thermal stability of the battery separator, which is connected to a mobile phone via a wireless transmission device, according to Embodiment 1 of this utility model. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings and embodiments. All other implementation methods obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] Example 1

[0028] like Figures 1-3 As shown, an in-situ observation device for the thermal stability of battery separators includes a magnifying glass 1, a windproof cover 2, a prototype separator 3, a heating platform 4, a microcomputer 5, and a display screen 6.

[0029] The heating platform 4 is frustum-shaped, and the windproof cover 2 is an open cylindrical shape with a radius larger than the upper circular radius of the heating platform 4, so that the windproof cover 2 is attached to the upper part of the heating platform 4 and sealed; the windproof cover 2 is made of transparent material; the prototype diaphragm 3 to be observed is placed in the heating area of ​​the heating platform 4;

[0030] One end of the magnifying observation device 1 enters the cylindrical interior through the windproof cover 2 to observe the prototype diaphragm 3, and the other end is connected to the microcomputer 5 through a transmission device; the microcomputer 5 is used to operate the magnifying observation device 1, process the data transmitted by the magnifying observation device 1, and perform visualization display.

[0031] The connection between the magnifying observation device 1 and the windproof cover 2 is provided with vertical, front-back, and left-right sliding rails, which are used to adjust the relative position distance between the magnifying observation device 1 and the prototype diaphragm 3.

[0032] Optionally, the other end of the magnifying observation device 1 can be directly connected to a computer via a USB wired transmission cable 7. Figure 1 ), or connected to a computer or mobile phone via wireless transmission device 8. Figure 2 , Figure 3 The computer has a display screen 6 for magnified display.

[0033] The magnifying observation device 1 is an optical microscope with a height of 10cm and a diameter of 3cm; the windproof cover 2 is a transparent glass with a height of 10cm and a diameter of 50cm; the heating stage 4 is 60cm long, 20cm wide, and 10cm high, with a top surface diameter of 40cm. The USB cable is a 100cm long high-definition cable.

[0034] In this embodiment, a magnifying glass observes the thermal contraction or stretching of the prototype diaphragm on the heating platform in situ through a windproof cover. (Refer to...) Figure 1 First, the prototype diaphragm 3 is placed in the heating area of ​​the heating stage, and then the heating stage 4 is heated. Next, the resolution of the microscope is adjusted. Finally, without changing the shape of the diaphragm after heating, the phenomenon of the prototype diaphragm shrinking or stretching due to heating on the heating stage is observed in situ.

[0035] The above description is merely an embodiment of this utility model and does not limit the scope of protection of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the scope of protection of this utility model.

Claims

1. A device for in-situ observation of the thermal stability of battery separators, characterized in that, It includes a magnifying observation device (1), a windproof cover (2), a heating stage (4), a microcomputer (5), and a transmission device; The heating platform (4) is frustum-shaped, and the windproof cover (2) is an open cylindrical shape with a radius larger than the upper circular radius of the heating platform (4), so that the windproof cover (2) is attached to the upper part of the heating platform (4) and sealed; the windproof cover (2) is made of transparent material; the prototype diaphragm (3) to be observed is placed in the heating area of ​​the heating platform (4); One end of the magnifying observation device (1) enters the cylindrical interior through the windproof cover (2) to observe the prototype diaphragm (3), and the other end is connected to the microcomputer (5) through the transmission device; the microcomputer (5) is used to operate the magnifying observation device (1), process the data transmitted by the magnifying observation device (1) and perform visualization display; The magnifying observation device (1) is connected to the windproof cover (2) at the top with vertical, front-back and left-right sliding rails, which are used to adjust the relative position distance between the magnifying observation device (1) and the prototype diaphragm (3).

2. The in-situ observation device for the thermal stability of battery separators according to claim 1, characterized in that, The transmission device is a wired transmission line (7) or a wireless transmission device (8), which connects the magnified observation device (1) to the microcomputer (5).

3. The in-situ observation device for the thermal stability of battery separators according to claim 2, characterized in that, The wired transmission line (7) is a USB high-definition cable with a length of 50-200cm.

4. The in-situ observation device for the thermal stability of battery separators according to claim 1, characterized in that, The magnifying observation device (1) is a microscope, including an optical microscope or an electron microscope.

5. The in-situ observation device for the thermal stability of battery separators according to claim 4, characterized in that, The microscope is 10-20cm high and 3-8cm in diameter.

6. The in-situ observation device for the thermal stability of battery separators according to claim 1, characterized in that, The windproof cover (2) is a transparent glass or silicone rubber sheet with a height of 10-20cm and a diameter of 50-100cm.

7. The in-situ observation device for the thermal stability of battery separators according to claim 6, characterized in that, The heating platform (4) is 60-100cm long, 20-50cm wide, and 10-20cm high, with a diameter of 40-80cm on the upper surface.

8. The in-situ observation device for the thermal stability of battery separators according to claim 1, characterized in that, The microcomputer (5) is a desktop computer, tablet computer or mobile phone.

9. The in-situ observation device for the thermal stability of battery separators according to claim 8, characterized in that, The microcomputer (5) is equipped with a display screen (6) to show the magnified diaphragm after it has been processed by the magnification observation device (1).

10. The in-situ observation device for the thermal stability of battery separators according to claim 1, characterized in that, The heating temperature range of the heating platform (4) is not less than 50 to 300°C.

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