Temperature-resistant battery expansion force detection device
By setting heat-insulating mesh on the upper and lower surfaces of the flexible distributed pressure sensor and optimizing the materials and structure, the problem of insufficient detection capability of the flexible pressure sensor in high-temperature environments was solved, and high sensitivity and wide range of battery expansion force detection were achieved.
Patent Information
- Application Number
- CN202520446019.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-14
AI Technical Summary
In existing battery expansion force detection devices, flexible pressure sensors have insufficient detection capability in low-pressure areas and signal recognition is greatly affected by temperature, resulting in high detection difficulty, low sensitivity and high cost.
High-temperature resistant materials and structural design are adopted, including the installation of heat-insulating mesh on the upper and lower end faces of the flexible distributed pressure sensor, and the optimization of the size and material of the electrode layer and the encapsulation layer to enhance the temperature resistance and sensitivity of the sensor.
This improves the ability of flexible pressure sensors to identify minute expansion forces, expands the detection temperature range and pressure testing range, enhances the sensitivity and accuracy of the detection device, and reduces detection costs.
Smart Images
Figure CN223941823U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery expansion force detection technology, and in particular to a heat-resistant battery expansion force detection device. Background Technology
[0002] Rechargeable batteries (also known as secondary batteries) are electrochemical energy storage devices that store and release electrical energy based on reversible electrochemical reactions. With the rapid development of new energy materials systems and process technologies, the energy density requirements for rechargeable batteries are becoming increasingly stringent. However, high energy density also increases the risk of thermal runaway and structural failure, making battery safety and cycle stability key bottlenecks restricting technological development. Currently, the industry is continuously driving technological breakthroughs in this field through material modification, interface optimization, and the development of intelligent management systems to meet the urgent needs of high-end applications such as electric vehicles and large-scale energy storage systems for high-performance batteries. Currently, the operating status of power batteries and energy storage stations is typically monitored and managed comprehensively through temperature detection, current detection, and other dimensions. Furthermore, changes in pressure between two battery packs or on the surface of the battery packs are tested to provide earlier warnings of battery safety. However, improving the sensitivity of pressure sensors to accurately and quickly respond to pressure changes under various complex environments remains a key research focus and challenge.
[0003] Because flexible pressure sensors are made of flexible materials, they feature fast response speed and high measurement accuracy, making them suitable for testing battery expansion force and assessing surface morphological changes. Therefore, common battery expansion force detection devices typically include a flexible pressure sensor and its associated data acquisition unit, such as a thin-film pressure sensor. Furthermore, flexible pressure sensors are usually arranged in an array of multiple sensing points. However, in actual battery expansion force testing, the battery itself experiences varying degrees of heat release during charging, leading to temperature increases. Conventional flexible pressure sensors are not temperature-resistant or exhibit strong thermoresistivity effects, requiring hardware or software compensation and correction of the tested signal. This necessitates the establishment of numerous simulation databases to improve the accuracy of the test data. This further increases the difficulty and cost of battery safety performance testing, and reduces the sensitivity and accuracy of the test results.
[0004] This invention provides a heat-resistant battery expansion force detection device to solve the problems of existing detection devices having insufficient detection capability in low-pressure areas due to their flexible pressure sensors and the significant influence of temperature on the recognition signal. Utility Model Content
[0005] The purpose of this invention is to provide a heat-resistant battery expansion force detection device to solve the problems of existing detection devices in the prior art, such as insufficient detection capability of flexible pressure sensors in low-pressure areas and significant influence of temperature on the recognition signal.
[0006] The technical solution of this utility model is: a heat-resistant battery expansion force detection device, comprising a battery pack, a flexible distributed pressure sensor, and a data acquisition and processing module; the battery pack comprises at least two battery cells; the flexible distributed pressure sensor is disposed between two adjacent battery cells;
[0007] The flexible distributed pressure sensor is connected to the data acquisition and processing module via an external cable; and each end face of the flexible distributed pressure sensor is provided with a heat-insulating mesh.
[0008] Preferably, the thickness of the heat-insulating mesh is 0.05-0.5 mm; the mesh size of the heat-insulating mesh is 0.1-5 mm; and the heat-insulating mesh is made of glass fiber or ceramic fiber.
[0009] Preferably, the flexible distributed pressure sensor includes a double-sided adhesive bonding isolation layer, an upper pressure sensing layer and a lower pressure sensing layer symmetrically disposed on both sides of the double-sided adhesive bonding isolation layer, an upper electrode layer disposed on the upper pressure sensing layer on the side away from the double-sided adhesive bonding isolation layer, a lower electrode layer disposed on the lower pressure sensing layer on the side away from the double-sided adhesive bonding isolation layer, an upper encapsulation layer disposed on the upper electrode layer on the side away from the upper pressure sensing layer, and a lower encapsulation layer disposed on the upper and lower electrode layers on the side away from the lower pressure sensing layer.
[0010] Preferably, both the upper electrode layer and the lower electrode layer are manufactured by screen printing using conductive silver paste or conductive carbon paste material that can withstand temperatures above 200°C. The lower electrode layer and the upper electrode layer are electrode layers with opposite horizontal and vertical orientations, and the edge dimension of each electrode block in the vertical electrode layer is generally 0.5-1mm larger than the edge dimension of each electrode block in the horizontal electrode layer.
[0011] Preferably, both the upper pressure sensing layer and the lower pressure sensing layer are prepared by screen printing using pressure-sensitive conductive ink that can withstand temperatures above 200°C; the resistance variation range of both the upper and lower pressure sensing layers is 100Ω-1MΩ; and the edge size of each pressure sensing block in the lower pressure sensing layer is 0.5-1mm larger than the edge size of each pressure sensing block in the upper pressure sensing layer.
[0012] Preferably, both the upper encapsulation layer and the lower encapsulation layer are made of sheet or film material that can withstand temperatures above 200°C; the sheet or film material is made of polyimide or polyetherimide; and the thickness of both the upper encapsulation layer and the lower encapsulation layer is 0.05-0.2 mm.
[0013] Preferably, the double-sided adhesive bonding isolation layer is made of glass fiber as the substrate and is prepared by coating polytetrafluoroethylene adhesive on both sides of the substrate; the thickness of the double-sided adhesive bonding isolation layer is 0.02-0.1 mm.
[0014] Preferably, the external cable is an FC cable or an FPC flexible circuit board that can withstand temperatures above 200°C.
[0015] Compared with the prior art, the advantages of this utility model are:
[0016] (1) The present invention provides a heat-resistant battery expansion force detection device. By setting a layer of heat-insulating mesh on the upper and lower end faces of a flexible distributed pressure sensor, the cross-shaped intersections of the mesh on the heat-insulating mesh can transmit different sizes of expansion forces on the battery pack to the flexible pressure sensor, reducing the influence of the double-sided adhesive isolation layer on the expansion force recognition, increasing the ability of the flexible pressure sensor to recognize smaller expansion forces, and enabling the flexible pressure sensor to generate electrical signals under small pressure, thereby improving the sensitivity and measurement range of expansion force detection; furthermore, the heat-insulating mesh is made of glass fiber cloth or ceramic with a certain heat insulation effect. Made of ceramic fiber cloth, the temperature resistance of the flexible distributed pressure sensor is further improved. Simultaneously, through optimized materials and a reasonable structural design and combination, the detection device has a wide operating temperature range and a wide pressure testing range, capable of testing the apparent expansion force or pressure of battery packs in the temperature range of -50℃ to 200℃ and the pressure range of 100Pa to 10MPa. This solves the problems of existing detection devices, such as high detection difficulty, poor sensitivity, low accuracy, and high detection cost due to the inability of the flexible pressure sensor to withstand high temperatures or the existence of a strong temperature resistance effect.
[0017] (2) The present invention provides a heat-resistant battery expansion force detection device. The components of the flexible distributed pressure sensor and the external cables in the detection device are preferably made of materials with a temperature resistance of 200°C or higher, so that the flexible distributed pressure sensor as a whole can withstand a temperature of 200°C or higher. In addition, in the flexible distributed pressure sensor, the edge size of each electrode block of the vertical electrode layer is 0.5-1mm larger than the overall size of each electrode block of the horizontal electrode layer, and the edge size of each pressure sensing block of the lower pressure sensing layer is 0.5-1mm larger than the overall size of the upper pressure sensing layer, which is beneficial to improving the uniformity and stability of the flexible distributed pressure sensor. Attached Figure Description
[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0019] Figure 1 This is the heat-resistant battery expansion force detection device described in Embodiment 1 of this utility model;
[0020] Figure 2 This is a schematic diagram of the structure of the flexible distributed pressure sensor described in this utility model;
[0021] Figure 3 This is the heat-resistant battery expansion force detection device described in Embodiment 2 of this utility model;
[0022] The components include: 1. Battery pack; 2. Thermal insulation mesh; 3. Flexible distributed pressure sensor; 301. Upper encapsulation layer; 302. Upper electrode layer; 303. Upper pressure sensing layer; 304. Double-sided adhesive bonding isolation layer; 305. Lower pressure sensing layer; 306. Lower electrode layer; 307. Lower encapsulation layer; 4. External cable; 5. Data acquisition and processing module. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to specific embodiments:
[0024] Implementation Method 1
[0025] A heat-resistant battery expansion force detection device includes a battery pack, a flexible distributed pressure sensor 3, and a data acquisition and processing module 5; wherein, as shown in the figure... Figure 1As shown, the battery pack includes two battery packs 1, namely the upper battery pack and the lower battery pack; the flexible distributed pressure sensor 3 is set between the upper battery pack and the lower battery pack and is connected to the data acquisition and processing module 5 through the external cable 4; the upper and lower end faces of the flexible distributed pressure sensor 3 are each padded with a layer of heat insulation mesh 2, which has a certain heat insulation effect and can be used to transmit the battery expansion force. In this embodiment, the heat insulation mesh 2 is made of glass fiber, and its thickness is 0.1 mm with a mesh size of 0.1 mm. The external cable 4 is an FC cable that can withstand temperatures above 200°C. In other embodiments, the external cable 4 can also be an FPC flexible circuit board that can withstand temperatures above 200°C. The heat insulation mesh 2 can also be made of glass fiber or ceramic fiber, and its thickness needs to be controlled within the range of 0.05-0.5 mm. The mesh size of the heat insulation mesh 2 needs to be controlled within the range of 0.1-5 mm. Through the cross-points of the mesh on the heat insulation mesh, different sizes of expansion forces on the battery pack can be transmitted to the flexible pressure sensor, reducing the influence of the double-sided adhesive layer on the expansion force recognition, increasing the ability of the flexible pressure sensor to recognize smaller expansion forces, and improving the 1 kPa-10 MPa expansion force recognition range to 100 Pa-10 MPa.
[0026] The flexible distributed pressure sensor 3 consists of upper and lower encapsulation layers 307, upper and lower electrode layers 306, upper and lower pressure sensing layers 305, and a double-sided adhesive bonding isolation layer 304; and, as Figure 2As shown, the upper pressure sensing layer 303 and the lower pressure sensing layer 305 are symmetrically arranged on both sides of the double-sided adhesive bonding isolation layer 304. The upper electrode layer 302 is disposed on the side of the upper pressure sensing layer 303 away from the double-sided adhesive bonding isolation layer 304, and the lower electrode layer 306 is disposed on the side of the lower pressure sensing layer 305 away from the double-sided adhesive bonding isolation layer 304. The upper encapsulation layer 301 is disposed on the side of the upper electrode layer 302 away from the upper pressure sensing layer 303, and the lower encapsulation layer 307 is disposed on the side of the upper and lower electrode layers 306 away from the lower pressure sensing layer 305. The double-sided adhesive bonding isolation layer 304 is made of glass fiber as the substrate, prepared by coating both sides of the substrate with polytetrafluoroethylene adhesive, and its thickness is 0.05 mm. In other embodiments, the thickness of the double-sided adhesive bonding isolation layer 304 needs to be controlled within the range of 0.02-0.1 mm. Both the upper electrode layer 302 and the lower electrode layer 306 are manufactured using a screen printing process with conductive silver paste material that can withstand temperatures above 200°C. Furthermore, the lower electrode layer 306 is a vertical electrode layer, while the upper electrode layer 302 is a horizontal electrode layer. The edge dimension of each electrode block in the lower electrode layer 306 is generally 0.5 mm larger than the edge dimension of each electrode block in the upper electrode layer 302. This design helps improve the uniformity and stability of the corresponding pressure sensing points. In other embodiments, both the upper electrode layer 302 and the lower electrode layer 306 can be manufactured using a screen printing process with conductive silver paste or conductive carbon paste material that can withstand temperatures above 200°C. The lower electrode layer 306 and the upper electrode layer 302 can be horizontal and vertical electrode layers, respectively. Furthermore, the edge dimension of each electrode block in the vertical electrode layer is generally 0.5-1 mm larger than the edge dimension of each electrode block in the horizontal electrode layer. In this embodiment, both the upper pressure sensing layer 303 and the lower pressure sensing layer 305 are prepared by screen printing using pressure-sensitive conductive ink that can withstand temperatures above 200°C. The resistance variation range of both the upper pressure sensing layer 303 and the lower pressure sensing layer 305 is 500Ω. Similarly, to improve the uniformity and stability of the corresponding pressure sensing points, the edge size of each pressure sensing block in the lower sensing layer is 0.5mm larger than the edge size of each pressure sensing block in the upper pressure sensing layer 303. In other embodiments, the resistance variation range of both the upper pressure sensing layer 303 and the lower pressure sensing layer 305 needs to be controlled within the range of 100Ω-1MΩ. The edge size of each pressure sensing block in the lower pressure sensing layer 305 is 0.5-1mm larger than the edge size of each pressure sensing block in the upper pressure sensing layer 303.In this embodiment, both the upper encapsulation layer 301 and the lower encapsulation layer 307 are made of a film material resistant to temperatures above 200°C, and the film material is a polyimide film; the thickness of both the upper encapsulation layer 301 and the lower encapsulation layer 307 is 0.1 mm. In other embodiments, the upper encapsulation layer 301 and the lower encapsulation layer 307 can be made of a sheet or film material resistant to temperatures above 200°C; the sheet or film material is polyimide or polyetherimide; the thickness of both the upper encapsulation layer 301 and the lower encapsulation layer 307 needs to be controlled within the range of 0.05-0.2 mm. The double-sided adhesive bonding isolation layer 304 is made of glass fiber as the substrate, prepared by coating both sides of the substrate with polytetrafluoroethylene adhesive; the thickness of the double-sided adhesive bonding isolation layer 304 is 0.02-0.1 mm.
[0027] Implementation Method 2
[0028] The difference between this embodiment and embodiment one is that the battery pack includes four battery pack cells 1, such as... Figure 3 As shown, four battery packs 1 are arranged side by side, and a flexible distributed pressure sensor 3 is installed between each pair of adjacent battery packs 1.
[0029] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.
Claims
1. A heat-resistant battery expansion force detection device, comprising a battery pack, a flexible distributed pressure sensor, and a data acquisition and processing module; the battery pack comprises at least two battery cells; the flexible distributed pressure sensor is disposed between two adjacent battery cells; The flexible distributed pressure sensor is connected to the data acquisition and processing module via an external cable; characterized in that... Each end face of the flexible distributed pressure sensor is equipped with a heat-insulating mesh.
2. The heat-resistant battery expansion force detection device according to claim 1, characterized in that: The thickness of the heat-insulating mesh is 0.05-0.5mm; the mesh size of the heat-insulating mesh is 0.1-5mm; the heat-insulating mesh is made of glass fiber or ceramic fiber.
3. The heat-resistant battery expansion force detection device according to claim 2, characterized in that: The flexible distributed pressure sensor includes a double-sided adhesive bonding isolation layer, an upper pressure sensing layer and a lower pressure sensing layer symmetrically disposed on both sides of the double-sided adhesive bonding isolation layer, an upper electrode layer disposed on the upper pressure sensing layer on the side away from the double-sided adhesive bonding isolation layer, a lower electrode layer disposed on the lower pressure sensing layer on the side away from the double-sided adhesive bonding isolation layer, an upper encapsulation layer disposed on the upper electrode layer on the side away from the upper pressure sensing layer, and a lower encapsulation layer disposed on the upper and lower electrode layers on the side away from the lower pressure sensing layer.
4. The heat-resistant battery expansion force detection device according to claim 3, characterized in that: Both the upper electrode layer and the lower electrode layer are manufactured by screen printing using conductive silver paste or conductive carbon paste material that can withstand temperatures above 200°C. The lower electrode layer and the upper electrode layer are horizontal and vertical electrode layers with opposite orientations, and the edge size of each electrode block in the vertical electrode layer is 0.5-1mm larger than the edge size of each electrode block in the horizontal electrode layer.
5. The heat-resistant battery expansion force detection device according to claim 3, characterized in that: Both the upper pressure sensing layer and the lower pressure sensing layer are made of pressure-sensitive conductive ink that can withstand temperatures above 200°C through a screen printing process; the resistance variation range of both the upper and lower pressure sensing layers is 100Ω-1MΩ; the edge size of each pressure sensing block in the lower pressure sensing layer is 0.5-1mm larger than the edge size of each pressure sensing block in the upper pressure sensing layer.
6. The heat-resistant battery expansion force detection device according to claim 3, characterized in that: Both the upper and lower encapsulation layers are made of sheets or films that can withstand temperatures above 200°C; the sheet or film is made of polyimide or polyetherimide; and the thickness of both the upper and lower encapsulation layers is 0.05-0.2 mm.
7. The heat-resistant battery expansion force detection device according to claim 3, characterized in that: The double-sided adhesive bonding isolation layer is made of glass fiber as the substrate, and is prepared by coating polytetrafluoroethylene adhesive on both sides of the substrate; the thickness of the double-sided adhesive bonding isolation layer is 0.02-0.1mm.
8. The heat-resistant battery expansion force detection device according to claim 2, characterized in that: The external cable is an FC cable or an FPC flexible circuit board that can withstand temperatures above 200°C.