Battery expansion force testing device

Abstract

The utility model provides a battery expansive force testing device which is applied to a battery component, the battery component comprises an upper battery assembly and a lower battery assembly, and the battery component comprises an isolation adhesive tape which is arranged between the upper battery assembly and the lower battery assembly and forms a supporting space; the pressure sensor is arranged in the supporting space, and the thickness size of the pressure sensor is larger than the height size of the supporting space. The isolation rubber strip is arranged between the upper battery assembly and the lower battery assembly, is located on the periphery of the pressure sensor, is attached to the edges of the upper battery assembly and the lower battery assembly, and can support the upper battery assembly, so that interference of continuous gravity compression of the upper battery assembly on an electric signal of the pressure sensor is avoided; therefore, the accuracy and the stability of the expansion force test are improved; meanwhile, sensing points of the pressure sensors are in close contact with the upper battery assembly and the lower battery assembly in the testing process, and expansive force of different degrees and different directions among battery components can be responded.

Description

Technical Field

[0001] This utility model relates to the technical field of expansion force testing, and more specifically, to a battery expansion force testing device. Background Technology

[0002] Currently, the operational status of power batteries and energy storage stations is typically monitored and managed comprehensively through dimensions such as temperature and current detection. Existing research uses pressure changes between two battery packs or on the surface of the battery packs to provide earlier warnings of battery safety. Improving the sensitivity of pressure sensors to accurately and quickly respond to pressure changes under various complex environments is a key research focus and challenge. Flexible pressure sensors can be used to test battery expansion force and assess changes in battery surface morphology. Common battery expansion force detection devices generally include thin-film pressure sensors and their associated data acquisition units. Thin-film pressure sensors are typically resistive or capacitive. Capacitive pressure sensors are more expensive, and the dielectric layer is significantly affected by temperature and magnetic fields. Resistive pressure sensors utilize changes in the resistance of the piezoresistive material in the sensing unit to respond to the location and magnitude of the applied force. When the piezoresistive material is subjected to stress, it causes changes in the energy band, resulting in a change in resistance. Although thin-film resistive pressure sensors have a certain degree of bending capability, they are made entirely of plastic sheet material and cannot withstand prolonged bending or tensile or bending forces not perpendicular to the sensor direction.

[0003] In the field of energy storage batteries, thin-film resistive pressure sensors are currently used to test battery expansion force. However, when using thin-film resistive pressure sensors, the battery expansion force is not entirely perpendicular to the battery direction. Therefore, in actual use, the test data of thin-film resistive pressure sensors may be inaccurate, and the reliability of the pressure sensor will gradually decrease during long-term charge-discharge cycles. Therefore, it is necessary to study more flexible pressure sensors for testing battery expansion force to cope with battery expansion force testing under different operating conditions. Utility Model Content

[0004] Therefore, in order to solve the problem of the gradual decrease in reliability of thin-film pressure sensors in the prior art during use, this utility model provides a battery expansion force testing device, the specific technical solution of which is as follows:

[0005] A battery expansion force testing device is applied to a battery component, the battery component including an upper battery assembly and a lower battery assembly, comprising:

[0006] An insulating strip is disposed between the upper battery assembly and the lower battery assembly, forming a support space;

[0007] A pressure sensor is disposed within the support space, and the thickness of the pressure sensor is greater than the height of the support space.

[0008] The data acquisition and processing module is electrically connected to the pressure sensor via an external cable.

[0009] The aforementioned battery expansion force testing device incorporates an insulating strip between the upper and lower battery components. This strip, located around the pressure sensor and adhering to the edges of the upper and lower battery packs, provides support for the upper battery component, preventing interference with the electrical signal of the pressure sensor caused by the continuous gravitational pressure of the upper battery component. This improves the accuracy and stability of the expansion force test. Simultaneously, the sensing point of the pressure sensor maintains close contact with both the upper and lower battery components during the test, enabling it to respond to expansion forces of varying degrees and directions between the battery components. The pressure signal is then transmitted to the data acquisition and processing module via an external cable.

[0010] Furthermore, the insulating strip is disposed on the outside of the pressure sensor, and the thickness of the insulating strip is 0.05mm to 0.1mm less than the thickness of the pressure sensor.

[0011] Furthermore, the substrate of the insulating strip is an elastomer material or an aerogel material.

[0012] Furthermore, the pressure sensor comprises an upper encapsulation layer, an upper substrate layer, an upper electrode layer, a resistance sensing layer, a lower electrode layer, a lower substrate layer, and a lower encapsulation layer arranged sequentially; the overall thickness of the pressure sensor is 0.3 mm to 2.0 mm.

[0013] Furthermore, the upper encapsulation layer and / or the lower encapsulation layer is a flame-retardant fabric, and the flame-retardant fabric is provided with a waterproof coating.

[0014] Furthermore, the upper base layer and / or lower base layer is a base fabric; the base fabric is a knitted or woven fabric with a weight of 80g to 150g.

[0015] Furthermore, the upper electrode layer and / or the lower electrode layer are composed of several composite conductive yarns, which are laid flat on the upper base layer or the upper base layer at equal intervals by sewing with an embroidery machine.

[0016] Furthermore, the resistance sensing layer is an antistatic cloth, which is a mesh-like fabric woven from antistatic yarns, and the mesh width of the mesh-like fabric is 1mm to 5mm.

[0017] Furthermore, the resistance range of the antistatic yarn is 0.01MΩ to 1MΩ, and the antistatic yarn is made by twisting antistatic fibers prepared by coaxial melt spinning.

[0018] Furthermore, the upper encapsulation layer and the lower encapsulation layer are connected by a sealing structure; the sealing structure is formed by laying hot melt adhesive strips at the edges and then pressing and bonding the hot melt adhesive strips together. Attached Figure Description

[0019] The present invention can be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale; rather, the focus is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0020] Figure 1 This is a schematic diagram of the structure of a battery expansion force testing device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the layer structure of the pressure sensor according to an embodiment of the present invention;

[0022] Figure 3 This is a thermal schematic diagram of a pressure sensor according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 2. Pressure sensor; 4. Insulation strip; 3. External cable; 6. Data acquisition and processing module;

[0025] 1. Upper battery assembly; 5. Lower battery assembly;

[0026] 21. Upper encapsulation layer; 22. Upper substrate layer; 23. Upper electrode layer; 24. Resistance sensing layer; 25. Lower electrode layer; 26. Lower substrate layer; 27. Lower encapsulation layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit its scope of protection.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0031] like Figure 1 As shown, a battery expansion force testing device according to one embodiment of the present invention is applied to a battery component, the battery component including an upper battery assembly 1 and a lower battery assembly 5, comprising:

[0032] An insulating strip 4 is disposed between the upper battery assembly 1 and the lower battery assembly 5, forming a support space;

[0033] Pressure sensor 2 is disposed within the support space, and the thickness of pressure sensor 2 is greater than the height of the support space.

[0034] The data acquisition and processing module 6 is electrically connected to the pressure sensor 2 via an external cable 3.

[0035] The aforementioned battery expansion force testing device incorporates an insulating strip 4 between the upper battery assembly 1 and the lower battery assembly 5. This insulating strip 4 is located around the pressure sensor 2, adhering to the edges of the upper and lower battery assemblies. The insulating strip 4 provides support for the upper battery assembly 1, preventing interference with the electrical signal of the pressure sensor 2 due to the continuous gravitational pressure of the upper battery assembly 1, thereby improving the accuracy and stability of the expansion force test. Simultaneously, the sensing point of the pressure sensor 2 is in close contact with the upper battery assembly 1 and the lower battery assembly 5 during the test, enabling it to respond to expansion forces of varying degrees and directions between the battery components. The pressure signal is then transmitted to the data acquisition and processing module 6 via an external cable 5.

[0036] In one embodiment, the insulating strip 4 is disposed on the outside of the pressure sensor 2, and the thickness of the insulating strip 4 is 0.05 mm to 0.1 mm less than the thickness of the pressure sensor 2.

[0037] In one embodiment, the substrate of the insulating strip 4 is an elastomer material or an aerogel material. Thus, the elastomer material has high elasticity and deformation recovery capability, while the aerogel material has ultra-light weight, high porosity, and excellent thermal insulation performance.

[0038] like Figure 2 and Figure 3As shown, in one embodiment, the pressure sensor 2 includes an upper encapsulation layer 21, an upper substrate layer 22, an upper electrode layer 23, a resistance sensing layer 24, a lower electrode layer 25, a lower substrate layer 26, and a lower encapsulation layer 27 arranged sequentially; the overall thickness of the pressure sensor 2 is 0.3 mm to 2.0 mm. Specifically, its length and width dimensions are both 1 cm to 2 cm smaller than the external dimensions of the upper battery assembly 1 and the lower battery assembly 5.

[0039] In one embodiment, the upper encapsulation layer 21 and / or the lower encapsulation layer 27 is a flame-retardant fabric with a waterproof coating. Thus, the flame-retardant fabric with a waterproof coating facilitates isolation between the upper and lower battery packs, mitigating the impact of damage or combustion of one battery pack on the other.

[0040] In one embodiment, the upper base layer 22 and / or the lower base layer 26 is a base fabric; the base fabric is a knitted or woven fabric with a weight of 80g to 150g.

[0041] In one embodiment, the upper electrode layer 23 and / or the lower electrode layer 25 are composed of a plurality of composite conductive yarns, which are sewn at equal intervals onto the upper base layer 22 or the lower base layer 26 by an embroidery machine. Thus, the composite conductive yarns possess excellent mechanical properties, are less prone to breakage during embroidery, and are priced at only 1 / 100th of stainless steel sewing thread and 1 / 10th of silver-plated conductive yarn, respectively.

[0042] In one embodiment, the resistance sensing layer 24 is an antistatic cloth, which is a mesh-like fabric woven from antistatic yarns, with a mesh width of 1mm to 5mm. Thus, the low-cost, commercially available electrode yarns and antistatic cloth materials reduce the overall product cost to 10% to 30% of similar products, facilitating large-scale application in the field of energy storage battery safety early warning.

[0043] In one embodiment, the antistatic yarn has a resistance range of 0.01 MΩ to 1 MΩ, and the antistatic yarn is formed by twisting antistatic fibers prepared by coaxial melt spinning. Thus, the conductive layer on the antistatic fiber exhibits excellent wash and abrasion resistance due to the melt processing technology.

[0044] In one embodiment, the upper encapsulation layer 21 and the lower encapsulation layer 27 are connected by a sealing structure; the sealing structure is formed by laying a hot melt adhesive strip at the edge and then heat-sealing the hot melt adhesive strip by pressing it together. Specifically, the width of the hot melt adhesive strip is 0.3cm to 1cm. Thus, using hot melt adhesive strips for encapsulation can improve the long-term fatigue resistance of the sensor encapsulation and avoid the problem of adhesive layer separation that may occur when using double-sided adhesive for encapsulation of the pressure sensor 2.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] 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 battery swelling force testing device applied to a battery component, the battery component comprising an upper battery assembly (1) and a lower battery assembly (5), characterized in that, include: An insulating strip (4) is disposed between the upper battery assembly (1) and the lower battery assembly (5) to form a support space; A pressure sensor (2) is disposed within the support space, and the thickness of the pressure sensor (2) is greater than the height of the support space. The data acquisition and processing module (6) is electrically connected to the pressure sensor (2) via an external cable (3).

2. The battery swelling force testing device of claim 1, wherein, The isolation strip (4) is disposed on the outside of the pressure sensor (2), and the thickness of the isolation strip (4) is 0.05mm to 0.1mm smaller than the thickness of the pressure sensor (2).

3. The battery swelling force testing device according to claim 1 or 2, characterized in that, The substrate of the isolation strip (4) is an elastomer material or an aerogel material.

4. The battery swelling force testing device of claim 1, wherein, The pressure sensor (2) includes an upper encapsulation layer (21), an upper base layer (22), an upper electrode layer (23), a resistance sensing layer (24), a lower electrode layer (25), a lower base layer (26), and a lower encapsulation layer (27) arranged sequentially. The overall thickness of the pressure sensor (2) is 0.3mm to 2.0mm.

5. The battery swelling force testing device of claim 4, wherein, The upper encapsulation layer (21) and / or the lower encapsulation layer (27) is a flame-retardant fabric, which has a waterproof coating.

6. The battery swelling force testing device of claim 4, wherein, The upper base layer (22) and / or the lower base layer (26) are base fabrics; The base fabric is a knitted or woven fabric with a weight of 80g to 150g.

7. The battery swelling force testing device of claim 4, wherein The upper electrode layer (23) and / or the lower electrode layer (25) are composed of several composite conductive yarns, which are laid flat on the upper base layer or the upper base layer at equal intervals by embroidery machine.

8. The battery swelling force testing device of claim 4, wherein, The resistance sensing layer (24) is an antistatic cloth, which is a mesh-like fabric woven from antistatic yarns, with a mesh width of 1mm to 5mm.

9. The battery swelling force testing device of claim 8, wherein, The resistance range of the antistatic yarn is 0.01MΩ to 1MΩ, and the antistatic yarn is made by twisting antistatic fibers prepared by coaxial melt spinning.

10. The battery swelling force testing device of claim 4, wherein, The upper encapsulation layer (21) and the lower encapsulation layer (27) are connected by a sealing structure; The sealing structure is formed by laying hot melt adhesive strips on the edges and then pressing and bonding the hot melt adhesive strips together.

Images