A strap pre-tension measuring tool and measuring assembly

Abstract

The utility model discloses a kind of strapping pre-tightening force measuring tools and measuring components, the strapping pre-tightening force measuring tool is used to measure the size of the pre-tightening force that multiple objects is bound after being bound by strapping, the measuring tool includes pressure sensing module and display, the pressure sensing module is used to be set between multiple the object to be clamped by two the object, and the thickness T of the pressure sensing module is the thickness of single the object N times, wherein N is positive integer, the display is signal connected with the pressure sensing module, the display is used to show the pressure data of the pressure sensing module;The present application mainly solves how to accurately measure the technical problem of the pre-tightening force value that multiple battery cells are bound by strapping.

Description

Technical Field

[0001] This utility model relates to the technical field of strapping pretension measurement, and in particular to a strapping pretension measuring tool and measuring components. Background Technology

[0002] With continuous breakthroughs in new energy technologies, lithium batteries have become a core component of the modern energy system. During technological iteration, prismatic cells have demonstrated significant competitiveness due to their structural advantages, particularly in electric vehicles and energy storage systems. During charging and discharging, the electrolyte undergoes redox reactions on the electrode surface, and carbonate solvents in the electrolyte decompose to produce gases such as CO2 and CH4. This gas production increases significantly, especially when the battery is overcharged. Furthermore, trace amounts of moisture in the electrolyte react with LiPF6 to generate HF and CO2. These gases accumulate within the sealed battery casing, creating internal pressure and causing the battery to swell. Abnormal SEI film growth, lithium dendrite puncture, and phase transitions in the cathode material can also cause cell swelling. Cell swelling can lead to multiple hazards for the product, such as the following:

[0003] Safety risks: Swelling of the battery cells may cause the explosion-proof valve to fail or the casing to rupture, and in extreme cases, may lead to electrolyte leakage, short circuit fire or even explosion;

[0004] Corrosion hazards: Swelling of the battery cell may cause the casing seal to fail, which may release electrolyte containing HF acid. This electrolyte may corrode the equipment and may burn the human body or cause electric shock.

[0005] Performance degradation: Cell swelling may damage the electrode structure and reduce lithium-ion migration efficiency. Experiments show that bulging batteries have a 30%-50% reduction in cycle life.

[0006] Currently, the common method to limit cell swelling is to apply an initial preload to the cell assembly (the initial preload is the pressure applied during battery module assembly to counteract the expansion force generated by the cells during charging and discharging). The initial preload affects cycle life through the coupling effect of mechanical constraints and electrochemical side reactions. If the initial preload is too low, the cell cycle life is shortened by more than 20%; if the initial preload is too high, it will trigger increased polarization and lithium plating, leading to a doubling of the cell capacity decay rate. Therefore, how to easily and quickly measure the initial preload of the battery pack and ensure it is within a reasonable range is crucial to the battery pack's lifespan. Currently, most companies, when producing prismatic cells, only use cylinder shaping to control the extrusion force during battery pack compression. They do not measure or control the actual preload force of the strapping (usually steel strapping) on ​​the cells after the cylinder is removed, which leaves potential safety hazards for battery quality. Utility Model Content

[0007] This utility model provides a strapping pretension force measuring tool and measuring components, which mainly solves the technical problem of how to accurately measure the pretension force value of multiple battery cells when strapping is used to bind them.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A strapping pretension force measuring tool is disclosed. The measuring tool is used to measure the magnitude of the pretension force on multiple objects after they are bound together with straps. The measuring tool includes a pressure sensing module and a display. The pressure sensing module is used to be positioned between the multiple objects so as to be clamped by two of the objects. The thickness T of the pressure sensing module is N times the thickness of a single object, where N is a positive integer. The display is signal-connected to the pressure sensing module and is used to display the pressure data of the pressure sensing module.

[0010] In one of the technical solutions, the pressure sensing module includes a sensor body and two pressure plates disposed on opposite sides of the sensor body. One pressure plate is connected to the fixed end of the sensor body, and the other pressure plate is connected to the force-bearing end of the sensor body. The thickness of the two pressure plates and the sensor body together is T. The sensor body is connected to the display for signal transmission.

[0011] In one of the technical solutions, the two pressure plates are slidably connected along the direction of force on the sensor body.

[0012] In one of the technical solutions, a guide post is connected between the two pressure plates. The guide post extends in the direction of force on the sensor body, and the two pressure plates are slidably connected through the guide post.

[0013] In one of the technical solutions, the side of the two pressure plates facing away from the sensor body is a first plane, and the side of the object that abuts against the pressure plate is a second plane. The area of ​​the first plane is greater than or equal to the area of ​​the second plane.

[0014] In one of the technical solutions, a signal line is connected between the sensor body and the display.

[0015] This application also provides a strapping pretension force measuring component, including at least one strapping strap, two end plates, and the strapping pretension force measuring tool described in any of the above technical solutions. The two end plates are respectively disposed on opposite sides of the plurality of objects, and the strapping strap is used to simultaneously bind the two end plates, the plurality of objects, and the pressure sensing module.

[0016] In one of the technical solutions, the strap pretension force measuring component further includes multiple foams, which are used to place between two adjacent objects.

[0017] In one of the technical solutions, the measuring component includes two straps, both of which are steel straps.

[0018] In one of the technical solutions, the multiple objects are all battery cells, and the thickness T of the pressure sensing module is N times the thickness of a single battery cell.

[0019] Compared with the prior art, the strapping pretension measuring tool provided by this utility model has at least the following beneficial effects:

[0020] In use, the pressure sensing module is placed between multiple objects (such as multiple battery cells), and then the straps are used to simultaneously bind the objects together. The pressure received by the pressure sensing module is the preload force applied by the straps to the multiple objects. The preload force value can be displayed on the screen. Furthermore, the thickness of the pressure sensing module in this design is designed to be N times the thickness of a single object (where N is a positive integer), making the preload force value detected by the pressure sensing module after the multiple objects are bound together more accurate. The design can be adjusted based on the measured preload value (e.g., changing the thickness of the battery cells or the circumference of the straps), which helps to quickly ensure that multiple objects are bound within a reasonable preload force range, thereby improving the cycle life and safety reliability of the battery product. In addition, the measurement process of this solution is relatively simple, and the numerical display is more intuitive, offering advantages such as ease of implementation and low cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a strap pretension force measuring tool provided in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a strap pretension force measuring component provided in an embodiment of this application;

[0024] Figure 3 A top view of the battery cell provided in an embodiment of this application.

[0025] Figure label:

[0026] 100. Pressure sensing module; 110. Screw; 120. Pressure plate; 121. First plane; 130. Display; 140. Sensor body; 150. Guide post; 160. Signal line; 210. Strap; 310. End plate; 410. Object; 420. Second plane; 510. Foam. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Please refer to the following: Figures 1 to 3This utility model embodiment provides a strap pretension force measuring tool. The measuring tool is used to measure the magnitude of the pretension force on multiple objects 410 after they are bound by straps 210. The measuring tool specifically includes a pressure sensing module 100 and a display 130. The pressure sensing module 100 is used to be placed between multiple objects 410 so that it can be clamped by two objects 410. The thickness T of the pressure sensing module 100 is N times the thickness H of a single object 410, where N is a positive integer. In other words, if the thickness H of a single object 410 is large, the thickness T of the pressure sensing module 100 can be equal to the thickness H of a single object 410. If the thickness H of a single object 410 is small, the thickness T of the pressure sensing module 100 can be equal to the total thickness of multiple objects 410. The display 130 is signal-connected to the pressure sensing module 100 and is used to display the pressure data of the pressure sensing module 100.

[0033] Specifically, in this embodiment, the object 410 takes a battery cell as an example. During use, the pressure sensing module 100 is placed between multiple battery cells, and then the strapping 210 simultaneously binds the multiple battery cells together. The pressure received by the pressure sensing module 100 at this time is the pre-tightening force applied by the strapping 210 to the multiple battery cells. The value of the pre-tightening force applied by the strapping 210 can be displayed on the display 130. Furthermore, the thickness of the pressure sensing module 100 in this solution is designed to be N times that of a single battery cell (where N is a positive integer), making the pre-tightening force value detected by the pressure sensing module 100 after the multiple battery cells are bound by the strapping 210 more accurate. The solution can be corrected based on the measured pre-tightening force value (e.g., changing the thickness of the battery cells or the circumference of the strapping 210), which helps to quickly ensure that multiple battery cells are bound by the strapping 210 within a reasonable pre-tightening force range, thereby improving the cycle life and safety reliability of the battery product. In addition, the measurement process of this solution is relatively simple, and the numerical display method is more intuitive, offering advantages such as ease of implementation and low cost.

[0034] It should be noted that the display 130 can be integrated into the pressure sensing module 100; that is, the pressure sensing module 100 can have its own digital display function, and the display 130 can also be integrated into the pressure sensing module 100. Figure 1 As shown, the pressure sensing module 100 and the pressure sensing module 100 are set separately. The pressure sensing module 100 can be connected to the display 130 via the signal line 160 to transmit pressure data to the display 130 via wired transmission. In other embodiments, the pressure sensing module 100 can also transmit pressure data to the display 130 via wireless transmission.

[0035] Please refer to it again. Figure 1The pressure sensing module 100 specifically includes a sensor body 140 and two pressure plates 120. The sensor body 140 is preferably a cylindrical pressure sensor. The sensor body 140 and the aforementioned display 130 are actually connected via a signal line 160. The two pressure plates 120 are respectively positioned on opposite sides of the sensor body 140. One pressure plate 120 is fixedly connected to the fixed end of the sensor body 140 by a screw 110, and the other pressure plate 120 is fixedly connected to the force-bearing end of the sensor body 140 by a screw 110. The combined thickness of the two pressure plates 120 and the sensor body 140 is the aforementioned T value. By using two pressure plates 120, the contact area between the pressure sensing module 100 and adjacent battery cells can be increased, thereby improving the accuracy of the pressure sensing module 100 in measuring the pre-tension force of the strapping 210 on multiple battery cells. More specifically, assuming that the side of the two pressure plates 120 facing away from the sensor body 140 is a first plane 121, and assuming that the side of the battery cell that abuts against the pressure plate 120 is a second plane 420, the area of ​​the first plane 121 in this scheme is greater than or equal to the area of ​​the second plane 420. With this design, the force situation of the battery cell can be simulated more accurately, which is conducive to further improving the accuracy of the pressure sensing module 100 in measuring the pretension force of the strap 210 on multiple battery cells.

[0036] Please refer to it again. Figure 1 The two pressure plates 120 are also slidably connected along the force direction (i.e., the X direction) of the sensor body 140. This design allows the two pressure plates 120 to apply pressure to the sensor body 140 along the X direction when under pressure, thereby further improving the accuracy of the pressure sensing module 100 in measuring the preload of the strapping 210 on multiple battery cells. Preferably, a guide post 150 is connected between the two pressure plates 120, extending in the X direction, through which the two pressure plates 120 achieve a slidable connection in the X direction.

[0037] Please see Figure 2This embodiment also provides a strap pretension force measuring component, which includes at least one strap 210, two end plates 310, and the aforementioned measuring tool. The two end plates 310 are respectively positioned on opposite sides of multiple objects 410. The strap 210 is used to simultaneously bind the two end plates 310, the multiple objects 410, and the aforementioned pressure sensing module 100. Here, the object 410 is again taken as a battery cell. In the battery field, the number of straps 210 is usually two, and the straps 210 are typically made of steel strips that are not easily broken. The end plates 310 are used to increase the force-bearing area of ​​the battery cell, preventing the strap 210 from directly pressurizing the battery cell and preventing excessive pressure on the battery cell, which could lead to severe deformation. Furthermore, the end plates 310 also serve as mounting seats; that is, the end plates 310 are provided with screw holes, allowing the end plates 310 to be locked into the battery box using screws, thus securing multiple battery cells within the battery box. In addition, for objects 410 that require force buffering, the strap pretension force measuring component may also include multiple foams 510, and a foam 510 needs to be placed between two adjacent cells during testing.

[0038] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A tool for measuring the preload of strapping, characterized in that, The measuring tool is used to measure the magnitude of the preload force on multiple objects after they are bound together with straps. The measuring tool includes a pressure sensing module and a display. The pressure sensing module is used to be positioned between the multiple objects so that it is clamped by two of the objects. The thickness T of the pressure sensing module is N times the thickness of a single object, where N is a positive integer. The display is signal-connected to the pressure sensing module and is used to display the pressure data of the pressure sensing module.

2. The strapping pretension measuring tool as described in claim 1, characterized in that, The pressure sensing module includes a sensor body and two pressure plates disposed on opposite sides of the sensor body. One pressure plate is connected to the fixed end of the sensor body, and the other pressure plate is connected to the force-bearing end of the sensor body. The thickness of the two pressure plates and the sensor body together is T. The sensor body is connected to the display for signal transmission.

3. The strapping pretension measuring tool as described in claim 2, characterized in that, The two pressure plates are slidably connected along the direction of force on the sensor body.

4. The strapping pretension measuring tool as described in claim 3, characterized in that, A guide post is connected between the two pressure plates. The guide post extends in the direction of force on the sensor body, and the two pressure plates are slidably connected through the guide post.

5. The strapping pretension measuring tool as described in claim 2, characterized in that, Let the side of the two pressure plates facing away from the sensor body be a first plane, and let the side of the object that abuts against the pressure plate be a second plane, wherein the area of ​​the first plane is greater than or equal to the area of ​​the second plane.

6. The strapping pretension measuring tool as described in claim 2, characterized in that, A signal line connects the sensor body to the display.

7. A strapping pretension force measuring component, characterized in that, It includes at least one strap, two end plates, and a strap pretension force measuring tool as described in any one of claims 1 to 6, wherein the two end plates are respectively disposed on opposite sides of the plurality of objects, and the strap is used to simultaneously bind the two end plates, the plurality of objects, and the pressure sensing module.

8. The strapping pretension force measuring component as described in claim 7, characterized in that, The strap pretension force measuring assembly also includes multiple foams for placement between two adjacent objects.

9. The strapping pretension force measuring component as described in claim 7, characterized in that, The measuring component includes two straps, both of which are steel straps.

10. The strapping pretension force measuring component as described in claim 7, characterized in that, The objects are all battery cells, and the thickness T of the pressure sensing module is N times the thickness of a single battery cell.

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