Battery expansion detection system

Abstract

The utility model discloses a battery expansion detection system which comprises a clamp assembly, a displacement sensor, a pressure sensor, an acquisition module and a processing platform. The clamp assembly comprises a base, a guide rod assembly, an upper clamping plate and a lower clamping plate. The guide rod assembly is arranged on the base in the vertical direction. The upper clamping plate and the lower clamping plate are slidably arranged on the guide rod assembly. A battery is clamped between the upper clamping plate and the lower clamping plate, and after the battery is clamped, the upper clamping plate is also used for placing a counter weight so as to apply preset pressure to the upper clamping plate, and the preset pressure is smaller than expansion force of the battery; the pressure sensor is arranged between the lower clamping plate and the base and is used for detecting the expansion force of the battery in real time; the displacement sensor is arranged above the upper clamping plate and is used for detecting the displacement of the upper clamping plate in real time; the acquisition module is used for acquiring data of the displacement sensor and the pressure sensor in real time; and the processing platform is used for processing the data of the displacement sensor and the pressure sensor acquired by the acquisition module and displaying the expansion force and the expansion displacement of the battery.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack battery technology, and in particular to a battery expansion detection system. Background Technology

[0002] During charging and discharging or other applications, pouch lithium batteries expand due to internal chemical reactions. This expansion directly affects the battery's structural safety, module assembly, and thermal management performance. The expansion behavior is primarily characterized by expansion force and displacement. Existing methods for measuring the expansion behavior of pouch lithium batteries include disassembly methods, which use micrometers to measure the cell thickness. However, these methods can only measure the thickness data at certain states of the cell and cannot accurately describe the complete expansion behavior of the pouch battery during a specific process. Utility Model Content

[0003] In view of this, the present invention provides a battery expansion detection system that can accurately detect the complete expansion behavior of a pouch battery in a certain process in real time.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A battery expansion detection system includes: a clamp assembly, a displacement sensor, a pressure sensor, a data acquisition module, and a processing platform;

[0006] The clamping assembly includes: a base, a guide rod assembly, an upper clamping plate, and a lower clamping plate;

[0007] The guide rod assembly is vertically mounted on the base;

[0008] The upper clamping plate and the lower clamping plate are slidably disposed on the guide rod assembly, and can slide up and down relative to the base; wherein, the upper clamping plate and the lower clamping plate are used to clamp the battery, and after the battery is clamped, the upper clamping plate is also used to place a counterweight to apply a preset pressure to the upper clamping plate, the preset pressure being less than the expansion force of the battery;

[0009] The pressure sensor is disposed between the lower clamping plate and the base, and is used to detect the expansion force of the battery in real time;

[0010] The displacement sensor is disposed above the upper clamping plate and is used to detect the displacement of the upper clamping plate in real time;

[0011] The acquisition module is used to acquire data from the displacement sensor and the pressure sensor in real time.

[0012] The processing platform is used to process the data collected by the displacement sensor and the pressure sensor by the acquisition module, and to display the expansion force and expansion displacement of the battery.

[0013] Preferably, the upper clamp is used to hold the battery;

[0014] The clamp assembly also includes an adjustment bracket;

[0015] The displacement sensor is mounted above the battery via the adjustment bracket and is used to detect the expansion displacement of the battery downwards in real time; wherein, the adjustment bracket can adjust the position of the displacement sensor detecting the battery.

[0016] Preferably, the adjusting bracket includes: a support rod, a first cross arm, a second cross arm, and a mounting base;

[0017] The support rod is vertically disposed on one side of the base;

[0018] One end of the first cross arm is rotatably connected to the top end of the support rod;

[0019] One end of the second cross arm is rotatably connected to the other end of the first cross arm;

[0020] The mounting base is located at the other end of the second cross arm and above the battery, and is used to mount the displacement sensor.

[0021] Preferably, the first end face of the mounting base is used to mount the displacement sensor, and the first end face of the mounting base is provided with an assembly connection structure for cooperating with the displacement sensor.

[0022] Preferably, the clamp assembly further includes: a first locking assembly and a second locking assembly;

[0023] The first locking assembly is used to lock the upper clamping plate to the guide rod assembly;

[0024] The second locking assembly is used to lock the lower clamping plate to the guide rod assembly.

[0025] Preferably, the guide rod assembly includes a plurality of guide rods;

[0026] Multiple guide rods are respectively arranged vertically on the base, and are located at multiple corners of the base;

[0027] The upper clamp plate has multiple corners that pass through multiple guide rods and can slide up and down along the multiple guide rods;

[0028] The lower clamp plate has multiple corners that pass through multiple guide rods and can slide up and down along the multiple guide rods;

[0029] The first locking assembly includes a plurality of first locking bolts and is used to lock the plurality of corners of the upper clamping plate to the plurality of guide rods one by one;

[0030] The second locking assembly includes a plurality of second locking bolts and is used to lock the plurality of corners of the lower clamp plate to the plurality of guide rods one by one.

[0031] Preferably, it also includes a temperature sensor and a flexible pressure sensor;

[0032] The temperature sensor is attached to the battery and is used to detect the temperature of the battery in real time.

[0033] The flexible pressure sensor is used to attach to the battery and to detect the surface pressure distribution of the battery in real time.

[0034] The acquisition module is also used to acquire data from the temperature sensor and the flexible pressure sensor in real time.

[0035] The processing platform is also used to process the data collected by the acquisition module from the temperature sensor and the flexible pressure sensor, and to display the temperature curve and surface pressure distribution thermogram of the battery.

[0036] Preferably, the acquisition module includes a data acquisition box;

[0037] The data acquisition box is used to simultaneously acquire data from the displacement sensor, the pressure sensor, the temperature sensor, and the flexible pressure sensor;

[0038] The processing platform is used to process the data collected by the displacement sensor, the pressure sensor, the temperature sensor and the flexible pressure sensor from the data acquisition box, and to display the expansion force, expansion displacement, temperature curve and surface pressure distribution thermogram of the battery in the interface partition.

[0039] Preferably, the panel of the data acquisition box has at least a displacement sensor port, a pressure sensor port, a temperature sensor port, and a flexible pressure sensor port;

[0040] The data acquisition box also contains a data acquisition card and a signal conditioning module;

[0041] The data acquisition card communicates with the displacement sensor port, the pressure sensor port, the temperature sensor port, and the flexible pressure sensor port through multiple acquisition channels. The signal conditioning module is used to convert the signals from the displacement sensor, the pressure sensor, and the temperature sensor into analog signals, and to convert the signal from the flexible pressure sensor into a serial port signal, so that the multiple acquisition channels of the data acquisition card can acquire them one by one.

[0042] Preferably, the processing platform is also used to replay the expansion force, expansion displacement, temperature curve, and surface pressure distribution thermogram of the battery.

[0043] As can be seen from the above technical solution, the battery expansion detection system provided by this utility model can accurately detect the complete expansion behavior of a soft-pack battery in a certain process in real time by using a displacement sensor, a pressure sensor, a data acquisition module and a processing platform. It can accurately detect the expansion displacement and expansion force of the battery for a long time. Attached Figure Description

[0044] 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.

[0045] Figure 1 This is a schematic diagram of the battery expansion detection system provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the fixture assembly and various sensors provided in the embodiments of this utility model;

[0047] Figure 3 This is a schematic diagram of the structure of the clamp assembly provided in an embodiment of the present utility model;

[0048] Figure 4 Another perspective structural schematic diagram of the clamp assembly provided in this embodiment of the utility model;

[0049] Figure 5 A real-time data acquisition visualization interface diagram provided for embodiments of this utility model;

[0050] Figure 6 A diagram of the battery information playback system provided in this embodiment of the utility model;

[0051] Figure 7 Flexible pressure thermogram provided for embodiments of this utility model;

[0052] Figure 8 The static force simulation analysis diagram of the upper clamping plate provided for the embodiment of this utility model.

[0053] Among them, 1 is the base, 2 is the upper clamping plate, 3 is the lower clamping plate, 4 is the support rod, 5 is the first cross arm, 6 is the second cross arm, 7 is the mounting base, 8 is the guide rod, 9 is the first locking bolt, 10 is the second locking bolt, 11 is the mounting block, 12 is the third locking bolt, 13 is the assembly connection hole, 14 is the battery, 15 is the temperature sensor, 16 is the flexible pressure sensor, 17 is the laser displacement sensor, 18 is the pressure sensor, 19 is the data acquisition box, and 20 is the processing platform. Detailed Implementation

[0054] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0055] The battery expansion detection system provided in this embodiment of the utility model, such as Figure 1 As shown, it includes: a clamp assembly, a displacement sensor, a pressure sensor, a data acquisition module, and a processing platform 20;

[0056] like Figure 3 As shown, the clamping assembly includes: a base 1, a guide rod assembly, an upper clamping plate 2, and a lower clamping plate 3;

[0057] The guide rod assembly is mounted vertically on the base 1;

[0058] The upper clamping plate 2 and the lower clamping plate 3 are slidably disposed on the guide rod assembly, and can slide up and down relative to the base 1; wherein, the upper clamping plate 2 and the lower clamping plate 3 are used to clamp the battery 14, and after the battery 14 is clamped, the upper clamping plate 2 is also used to place a counterweight to apply a preset pressure to the upper clamping plate 2, the preset pressure being less than the expansion force of the battery 14;

[0059] like Figure 2 As shown, the pressure sensor 18 is located between the lower clamping plate 3 and the base 1, and is used to detect the expansion force of the battery 14 in real time.

[0060] The displacement sensor is located above the upper clamping plate 2 and is used to detect the displacement of the upper clamping plate 2 in real time.

[0061] The acquisition module is used to acquire data from the displacement sensor and pressure sensor 18 in real time;

[0062] The processing platform 20 is used to process the data collected by the acquisition module from the displacement sensor and pressure sensor 18, and to display the expansion force and expansion displacement of the battery 14.

[0063] It should be noted that, as Figure 3As shown, the guide rod assembly can be vertically positioned at multiple corners of the base 1; the upper clamping plate 2 and the lower clamping plate 3 are arranged parallel to each other vertically, and the guide rod assembly can pass through multiple corners of the lower clamping plate 3 and multiple corners of the upper clamping plate 2 respectively, so that the upper clamping plate 2 and the lower clamping plate 3 can slide up and down relative to the base 1; wherein, the upper clamping plate 2 and the lower clamping plate 3 can be used to clamp the battery 14, and after the battery 14 is clamped, the upper clamping plate 2 is also used to place a counterweight (which can be a weight) to apply a preset pressure less than the expansion force of the battery 14 to the upper clamping plate 2, ensuring that the battery 14 can expand upward normally; wherein, the battery 14 can be the soft-pack lithium battery to be tested, and can be in a charging or discharging state during the testing process; of course, during the expansion of the battery 14, the upper clamping plate 2 and the lower clamping plate 3 are not fixed and can slide up and down relative to the guide rod assembly; as Figure 2 As shown, the pressure sensor 18 can be mounted on the base 1 and contact the lower clamping plate 3, and is used to detect the expansion force of the battery 14 in real time; the displacement sensor can be mounted above the upper clamping plate 2 via a bracket, and is used to detect the displacement of the upper clamping plate 2 in real time, which is also used to detect the expansion displacement of the battery 14 in real time; wherein, as Figure 2 As shown, the displacement sensor can be a high-precision laser displacement sensor 17; the acquisition module is used to acquire data detected by the displacement sensor and pressure sensor 18 in real time; the processing platform 20 is used to process the data acquired by the acquisition module from the displacement sensor and pressure sensor 18, and display the expansion displacement and expansion force of the battery 14; wherein, the processing platform 20 processes the data acquired by the acquisition module from the displacement sensor and pressure sensor, and displays the expansion displacement and expansion force of the battery 14, and this design of the processing platform 20 can adopt existing technology; of course, through the above design, the complete expansion behavior of the battery (such as a pouch battery) in a certain process can be detected in real time and accurately, that is, the expansion displacement and expansion force of the battery can be accurately detected for a long time.

[0064] Of course, the above process can be a constant pressure detection mode for the battery; that is, the battery 14 to be tested is placed between the upper clamping plate 2 and the lower clamping plate 3 of the clamping assembly. The upper clamping plate 2 and the lower clamping plate 3 are not fixed. At the same time, a weight is placed on the upper clamping plate 2 to apply a constant pressure less than its expansion force to the battery 14. The pressure sensor 18 can be placed between the base 1 and the lower clamping plate 3 and is used to detect the expansion force of the battery 14. The displacement sensor can be used to detect the displacement of the center position of the upper clamping plate 2. When a constant pressure is applied during the charging process of the battery 14, the acquisition module can collect the data from the displacement sensor and the pressure sensor 18, and then process the data through the processing platform 20 to obtain and display the expansion displacement and expansion force of the battery 14.

[0065] In this design, the upper clamp 2 is also used to place the battery 14;

[0066] The clamp assembly also includes an adjustment bracket;

[0067] The displacement sensor is mounted above the battery 14 via an adjustable bracket and is used to detect the expansion displacement of the battery 14 downwards in real time; the adjustable bracket can adjust the position of the displacement sensor detecting the battery 14.

[0068] It should be noted that battery 14 can also be placed on the upper clamping plate 2; the adjustment bracket can be set on one side of the base 1, and its adjustment end can be suspended above the upper clamping plate 2 and can move along the XY direction; such as Figure 2 As shown, the displacement sensor can be set at the adjustment end of the adjustment bracket, above the upper clamping plate 2 and also above the battery 14, and is used to detect the expansion displacement of the battery 14 in real time. Of course, the battery 14 can be placed on the upper clamping plate 2 at this time. The adjustment end of the adjustment bracket can drive the displacement sensor to move along the XY direction, so as to adjust the position of the displacement sensor detecting the battery 14, thus enabling the displacement sensor to detect the expansion displacement of the battery 14 at any position. In addition, based on the structure of the clamping assembly, this battery expansion detection system can realize multiple detection modes, such as the constant pressure detection mode mentioned above and the free expansion detection mode mentioned above. In the free expansion detection mode, the lower clamping plate 3 and the upper clamping plate 2 are first stacked on the base 1, and then the battery 14 is placed directly on the upper clamping plate 2. Then, the displacement sensor is moved in the XY direction by adjusting the adjustment end of the bracket so that the displacement sensor can detect the expansion displacement of the battery 14 at any position. The displacement sensor can be moved to the center of the battery 14 by adjusting the adjustment end of the bracket, and the displacement sensor can detect the free expansion displacement of the battery 14 in real time during charging. Then, with the cooperation of the acquisition module and the processing platform 20, the expansion displacement of the battery 14 in the free expansion state can be displayed.

[0069] Specifically, such as Figure 3 As shown, the adjusting bracket includes: a support rod 4, a first cross arm 5, a second cross arm 6, and a mounting base 7;

[0070] The support rod 4 is vertically positioned on one side of the base 1;

[0071] One end of the first cross arm 5 is rotatably connected to the top of the support rod 4;

[0072] One end of the second cross arm 6 is rotatably connected to the other end of the first cross arm 5;

[0073] Mounting base 7 is located at the other end of the second cross arm 6 and above the battery 14, and is used to mount the displacement sensor.

[0074] It should be noted that, as Figure 3As shown, the support rod 4 can be vertically positioned on one side of the base 1, i.e., the support rod 4 is a vertical support rod; one end of the first horizontal arm 5 can be rotatably connected to the top of the support rod 4 via an adapter; one end of the second horizontal arm 6 can be rotatably connected to the other end of the first horizontal arm 5 via a pin; the mounting base 7 can be positioned at the other end of the second horizontal arm 6 and above the battery 14, and is used to mount the displacement sensor; wherein, the mounting base 7 is equivalent to the adjusting end of the adjusting bracket, and through the rotatable connection at the above two locations, the mounting base 7 can move along the XY direction, and the mounting base 7 can be a vertical mounting plate; of course, this design of the adjusting bracket is simple in structure and convenient in adjustment.

[0075] Furthermore, such as Figure 2 As shown, the first end face of the mounting base 7 is used to mount the displacement sensor, and the first end face of the mounting base 7 is provided with an assembly connection structure for cooperating with the displacement sensor. As described above, such as... Figure 2 As shown, the mounting base 7 can be a vertical mounting plate, and its outer plate surface (i.e., the first end face of the mounting base 7) is used to mount the displacement sensor; of course, the inner plate surface of the mounting base 7 is located at the other end of the second cross arm 6, as shown. Figure 4 As shown, the outer plate of the mounting base 7 may be provided with multiple assembly connection holes 13 for cooperating with the displacement sensor; wherein, the multiple assembly connection holes may be through holes; specifically, after the displacement sensor is installed on the outer plate of the mounting base 7, the displacement sensor and the multiple assembly connection holes of the mounting base 7 can be connected by bolt assembly; of course, this design makes the assembly and connection of the displacement sensor more convenient.

[0076] Furthermore, such as Figure 3 As shown, the clamping assembly also includes: a first locking assembly and a second locking assembly;

[0077] The first locking assembly is used to lock the upper clamping plate 2 to the guide rod assembly;

[0078] The second locking component is used to lock the lower clamping plate 3 to the guide rod assembly; in this way, the upper clamping plate 2 and the lower clamping plate 3 can be locked after sliding up and down, preventing the upper clamping plate 2 and the lower clamping plate 3 from shaking.

[0079] In this plan, such as Figure 3 As shown, the guide rod assembly includes multiple guide rods 8;

[0080] Multiple guide rods 8 are respectively set vertically on the base 1, and are located at multiple corners of the base 1;

[0081] Multiple corners of the upper clamping plate 2 pass through multiple guide rods 8, and can slide up and down along multiple guide rods 8;

[0082] Multiple edges and corners of the lower clamping plate 3 pass through multiple guide rods 8, and can slide up and down along multiple guide rods 8;

[0083] The first locking assembly includes a plurality of first locking bolts 9, and is used to lock the plurality of corners of the upper clamping plate 2 to the plurality of guide rods 8 one by one;

[0084] The second locking assembly includes a plurality of second locking bolts 10, and is used to lock the plurality of corners of the lower clamping plate 3 to the plurality of guide rods 8 one by one.

[0085] It should be noted that, as Figure 3 As shown, the number of guide rods 8 can be four; the base 1 can be a rectangular base; the four guide rods 8 are respectively set vertically on the base 1, and are located at the four corners of the base 1; the upper clamping plate 2 can be a rectangular upper clamping plate, and its four corners are penetrated by the four guide rods 8, and it can slide up and down along the four guide rods 8; the lower clamping plate 3 can be a rectangular lower clamping plate, and its four corners are penetrated by the four guide rods 8, and it can slide up and down along the four guide rods 8; of course, the lower clamping plate 3 is located below the upper clamping plate 2; the number of first locking bolts 9 There can be four first locking bolts 9, which are used to lock the four corners of the upper clamping plate 2 to the four guide rods 8 one by one; there can also be four second locking bolts 10, which are used to lock the four corners of the lower clamping plate 3 to the four guide rods 8 one by one; of course, this design is simple in structure, convenient in locking, reliable and stable; in addition, the above-mentioned parts of the clamping assembly can be made of aluminum alloy material by CNC precision machining, and the surface of the parts can be anodized, taking into account both strength and light weight.

[0086] Specifically, such as Figure 1 As shown, the battery expansion detection system provided in this embodiment of the present invention also includes a temperature sensor 15 and a flexible pressure sensor 16;

[0087] Temperature sensor 15 is attached to battery 14 and is used to detect the temperature of battery 14 in real time;

[0088] The flexible pressure sensor 16 is used to attach to the battery 14 and to detect the surface pressure distribution of the battery 14 in real time.

[0089] The acquisition module is also used to acquire data from the temperature sensor 15 and the flexible pressure sensor 16 in real time;

[0090] The processing platform 20 is also used to process the data collected by the acquisition module from the temperature sensor 15 and the flexible pressure sensor 16, and to display the temperature curve and surface pressure distribution heat map of the battery 14.

[0091] It should be noted that, as Figure 1As shown, temperature sensor 15 can be attached to the upper surface of battery 14 and used to detect the temperature of battery 14 in real time; flexible pressure sensor 16 can be attached to the lower surface of battery 14 and used to detect the pressure distribution on the lower surface of battery 14 in real time; wherein, as Figure 2 As shown, the flexible pressure sensor 16 can be a bendable thin-film sensor with a 16×16 array (256 sensing points) for measuring the pressure distribution on the battery surface. The acquisition module is also used to acquire data detected by the temperature sensor and the flexible pressure sensor in real time. The processing platform 20 is also used to process the data acquired by the acquisition module from the temperature sensor 15 and the flexible pressure sensor 16, and to display the temperature curve and surface pressure distribution heatmap of the battery 14. That is, the processing platform 20 is also used to process the data acquired by the acquisition module from the temperature sensor 15 and to display the temperature curve of the battery 14, and is also used to process the data acquired by the acquisition module from the flexible pressure sensor 16, such as... Figure 7 As shown, a surface pressure distribution thermogram of battery 14 is displayed, thus enabling the detection of surface temperature and surface pressure distribution of battery 14, as well as the visualization of temperature curves and surface pressure distribution thermograms of battery 14; among which, as Figure 5 As shown, the temperature curve of battery 14 can be a time-temperature curve. Temperature sensor 15 can sample at a frequency of 1Hz. Processing platform 20 can process the data from temperature sensor 15 and generate the temperature curve accordingly. The surface pressure distribution heat map of battery 14 can be generated by measuring the pressure generated at different locations on flexible pressure sensor 16 by battery 14 (pouch battery). Figure 1 As shown, the flexible pressure sensor 16 is placed below the battery 14 to detect the pressure generated on the lower surface of the battery 14. The data collected by the flexible pressure sensor 16 can be used by the software algorithm of the processing platform 20 to generate a surface pressure distribution heat map. Of course, the above design of the processing platform 20 can adopt existing technology. In other words, this solution, through the use of displacement sensor, pressure sensor 18, temperature sensor 15, flexible pressure sensor 16, acquisition module and processing platform 20, can realize the real-time detection and visualization of multiple parameters such as expansion displacement, expansion force, temperature and surface pressure distribution during the expansion process of the battery 14, which facilitates a better understanding of the expansion behavior of the battery 14.

[0092] Furthermore, such as Figure 1 As shown, the acquisition module includes a data acquisition box 19;

[0093] Data acquisition box 19 is used to synchronously acquire data from displacement sensor 18, pressure sensor 18, temperature sensor 15 and flexible pressure sensor 16;

[0094] The processing platform 20 is used to process the data collected by the data acquisition box 19 from the displacement sensor, pressure sensor 18, temperature sensor 15 and flexible pressure sensor 16, and to display the expansion displacement, expansion force, temperature curve and surface pressure distribution thermal map of the battery 14 in the interface partition.

[0095] It should be noted that the data acquisition box 19 can simultaneously acquire the above-mentioned multiple parameters during the expansion process of the battery 14, and can achieve data alignment through a unified timestamp (the different acquisition frequencies of the charging and discharging equipment, pressure, temperature and displacement sensors lead to different acquisition times, which can be accurately recorded through a unified timestamp). This avoids the problem of asynchronous acquisition of multiple sensor signals, scattered data processing, and difficulty in joint analysis. The processing platform 20 can process the data acquired by the displacement sensor, pressure sensor 18, temperature sensor 15 and flexible pressure sensor 16 acquired by the data acquisition box 19, and display the expansion displacement, expansion force, temperature curve and surface pressure distribution heat map of the battery 14 in the interface partition. This enables the partitioned display of the expansion displacement, expansion force, temperature curve and surface pressure distribution heat map of the battery 14, thereby facilitating a better understanding of the expansion displacement, expansion force, temperature curve and surface pressure distribution heat map of the battery 14. Of course, the processing platform 20 can use existing technology to implement the above design, and the processing platform 20 can be developed by LabVIEW and can display the voltage, current, expansion force, expansion displacement, temperature curve and surface pressure distribution heat map of the battery 14 in real time.

[0096] Furthermore, such as Figure 1 As shown, the panel of the data acquisition box 19 has at least a displacement sensor port, a pressure sensor port, a temperature sensor port, and a flexible pressure sensor port.

[0097] The data acquisition box 19 also contains a data acquisition card and a signal conditioning module;

[0098] The data acquisition card communicates with the displacement sensor port, pressure sensor port, temperature sensor port and flexible pressure sensor port through multiple acquisition channels. The signal conditioning module is used to convert the signals from the displacement sensor, pressure sensor 18 and temperature sensor 15 into analog signals, and to convert the signal from the flexible pressure sensor 16 into serial port signals, so that the multiple acquisition channels of the data acquisition card can acquire them one by one.

[0099] It should be noted that the panel of the data acquisition box 19 has at least a displacement sensor port, a pressure sensor port, a temperature sensor port, and a flexible pressure sensor port, and is used for communication connection with the displacement sensor 18, the pressure sensor 15, and the flexible pressure sensor 16 one by one; that is, the panel of the data acquisition box 19 has dedicated ports for displacement, pressure, temperature, and flexible sensors; that is, the detection data of each sensor is input through the corresponding port of the data acquisition box 19, the sampling clock is synchronized, and the data timestamps are consistent; the data acquisition card can be an NI USB-6211 data acquisition card, and it communicates with the displacement sensor port, the pressure sensor port, the temperature sensor port, and the flexible pressure sensor port one by one through four acquisition channels; that is, the NI USB-6211 data acquisition card supports multi-channel synchronous acquisition, that is, the NI USB-6211 data acquisition card can be responsible for synchronously acquiring analog signals such as voltage / current / pressure / displacement / temperature; the serial port module (i.e., the signal conditioning module) reads the flexible array data, and the software uniformly manages the timestamp to ensure synchronous updates;

[0100] The signal conditioning module converts the signals from the displacement sensor, pressure sensor, and temperature sensor transmitted to their respective ports into analog signals, and converts the signals from the flexible pressure sensor transmitted to its corresponding port into serial signals, so that the four acquisition channels of the data acquisition card can acquire them one by one. In other words, the displacement sensor, pressure sensor 18, temperature sensor 15, and flexible pressure sensor 16 output standard analog signals or serial signals through the signal conditioning module, and all signals are then centrally acquired by the NI USB-6211 data acquisition card. The NI USB-6211 data acquisition card performs multi-channel synchronous sampling (error less than 0.1%), with each channel acquiring one physical quantity parameter. The serial communication module (i.e., the signal conditioning module) receives the flexible array signals in parallel. The two data streams are fused through the LabVIEW platform (i.e., processing platform 20). (That is, the serial communication module synchronously acquires data from the flexible pressure sensor, and the acquired matrix data, along with the physical quantity parameter data acquired from other channels, is processed and stored through the LabVIEW software system platform (i.e., processing platform 20). Of course, the data acquisition box 19 can realize multi-channel synchronous signal acquisition and signal conditioning.

[0101]

[0102] As mentioned above, the displacement sensor can be a high-precision laser displacement sensor, which uses diffuse reflection ranging + CMOS detection technology and features high resolution, high linearity accuracy and high response speed. Its measurement signal is output through analog (0–10V) or RS-485 communication and can be directly connected to the NI USB-6211 data acquisition card to realize non-contact displacement detection.

[0103] Of course, the internal layout of the data acquisition box 19 shields and centrally manages all signal lines, ensuring good electromagnetic compatibility and guaranteeing signal synchronization and stability. In addition, the data acquisition box 19 also includes power management, which can support a unified 24V DC power supply.

[0104] In this scheme, the processing platform 20 is also used to replay the expansion force, expansion displacement, temperature curve and surface pressure distribution thermogram of the battery 14 in order to better understand the expansion behavior of the battery 14.

[0105] It should be noted that the processing platform 20 is used to replay the previously displayed expansion force, expansion displacement, temperature curve, and surface pressure distribution heatmap of battery 14; that is, the processing platform 20 can process the collected data and generate various time-related data graphs, such as expansion force, expansion displacement, temperature curve, and surface pressure distribution heatmap. Figure 6 As shown, the processing platform 20 also includes a data playback module (which can be developed using Python + PyQt) to support historical data playback, multi-curve comparison, and heat map reconstruction. It is also used to playback the expansion force, expansion displacement, temperature curves, and surface pressure distribution heat map of battery 14. The design of this data playback module can utilize existing technologies. Specifically, the data playback module may include a data storage module and a playback and analysis module. The data storage module is used to uniformly write data from all channels into Excel / CSV format, including timestamps and multi-table structures, preparing for direct playback reading. The data storage module is compatible with various data formats and saves data in Excel / CSV format for playback analysis. The analysis module, developed using Python and PyQt, can automatically identify data types and generate corresponding views (curves or heatmaps) after importing acquired files. Furthermore, the playback and analysis modules can run independently, with adjustable playback speed, frame-by-frame navigation, and strong visualization capabilities, simultaneously displaying multi-channel curves and pressure heatmaps. The processing platform also includes a real-time display module, which displays data from various sensors in partitioned areas, including: voltage, current, capacity, and energy curves; pressure / displacement / temperature curves; and a flexible array heatmap area. All charts can be switched synchronously between the time axis and capacity axis, while maintaining consistency on the X-axis. The entire processing platform can be developed using either Python or LabVIEW.

[0106] In other words, this system integrates hardware modules, signal acquisition modules (i.e., NI USB-6211 data acquisition cards), and processing platforms into a single platform.

[0107] Hardware layer: The four types of sensors, namely displacement sensor, pressure sensor, temperature sensor and flexible pressure array sensor, output standard voltage or serial port signal through transmitter (i.e. signal conditioning module). All signals are connected to the data acquisition box and centrally acquired by NI USB-6211 data acquisition card.

[0108] Data layer: NI USB-6211 data acquisition card performs multi-channel synchronous sampling (error less than 0.1%), and serial communication module receives flexible array signals in parallel; the two data streams are fused through the LabVIEW platform; each channel can acquire one physical quantity parameter, and multiple channels can acquire multiple physical quantity parameters.

[0109] Software layer: The online data acquisition and real-time display platform is used to configure hardware interfaces, acquire data, and display it in real time (that is, to process and visualize the data signals acquired by the sensors through the hardware interface). The data playback system operates independently and is responsible for multi-channel synchronous playback and multi-sensor heat map reconstruction.

[0110] In addition, this system supports four detection modes for pouch batteries: free expansion, constant pressure, zero gap, and constant gap. These four detection modes are free expansion detection mode, constant pressure detection mode, zero gap detection mode, and constant gap detection mode.

[0111] 1. Free expansion detection mode: As mentioned above, place the test battery directly on the upper clamping plate of the fixture assembly, with the temperature sensor in close contact with the battery surface, and the laser displacement sensor irradiating the center of the battery and zeroing it. Then start running the system to collect the expansion displacement and temperature data of the battery during the free expansion process of charging.

[0112] 2. Constant pressure detection mode: As mentioned above, the test battery is placed between the upper and lower clamping plates of the clamping assembly. Neither the upper nor lower clamping plates are fixed. At the same time, a weight is placed on the upper clamping plate to apply a constant pressure to the battery. The constant pressure is less than the battery's expansion force. The temperature sensor is in close contact with the battery surface, and the pressure sensor is placed between the base and the lower clamping plate. The laser displacement sensor is irradiated to the center of the upper clamping plate and zeroed. Then the system starts running and collects the displacement, temperature, and global pressure (expansion force) data of the battery when a constant pressure is applied during charging.

[0113] 3. Zero-gap detection mode: Place the test battery between the upper and lower clamping plates of the fixture assembly. Use a feeler gauge to ensure that the battery is in close contact with the upper and lower clamping plates so that the gap between the three is 0 and no pressure is generated. Then fix (lock) the upper clamping plate, leave the lower clamping plate unfixed, place the temperature sensor in close contact with the battery surface, place the pressure sensor between the base and the lower clamping plate, and place the flexible pressure sensor under the battery. Run the system to collect temperature, global pressure and local pressure data of the battery during the charging process.

[0114] 4. Constant gap detection mode: Place the test battery on the lower clamping plate of the fixture assembly. Use a feeler gauge to adjust the distance between the battery and the upper clamping plate to the test height. Then fix the upper clamping plate and leave the lower clamping plate unfixed. The temperature sensor is in close contact with the battery surface, the pressure sensor is placed between the base and the lower clamping plate, and the flexible pressure sensor is placed under the battery. Run the system to collect temperature, global pressure, and local pressure data when the battery has a certain expansion displacement during the charging process.

[0115] In addition, the workflow of this system is as follows:

[0116] Clamp the battery into the fixture assembly and adjust the clamping plate according to the test mode;

[0117] Each sensor is installed and connected to the corresponding port of the data acquisition box;

[0118] Configure the data acquisition box with acquisition channels and parameters;

[0119] Once the data acquisition is initiated, the system will simultaneously acquire multiple signals and display them in real time.

[0120] Of course, this system has a high degree of integration, simplified wiring, and significantly shortened installation and debugging time; moreover, it improves detection efficiency, has high data accuracy, supports multi-parameter joint analysis, and can provide comprehensive data support for battery safety assessment.

[0121] Meanwhile, this system supports switching between multiple detection modes (free expansion, constant pressure, zero gap, constant gap); and while ensuring stability, it reduces volume and weight, improving experimental sensitivity and operability; furthermore, it allows for simulation analysis of fixture components: static simulation of aluminum alloy fixture components can also be performed using Abaqus software; such as Figure 8 As shown, the simulation results indicate that under the load of simulated battery expansion force, the maximum stress of the fixture is approximately 68 MPa, which is far below the material yield limit (205-310 MPa), verifying the safety and reliability of the structure.

[0122] Hardware module integration method and signal flow

[0123] Unified sampling clock and timestamp: All analog quantities are sampled uniformly by the NI USB-6211 data acquisition card, and serial port data is fused using synchronous timestamps to ensure data alignment across multiple modules;

[0124] Centralized power supply and wiring numbering system: The data acquisition boxes are uniformly powered by 24V and the ports are numbered to facilitate module plugging and unplugging and maintenance.

[0125] Modular software interface: Various sensors (pressure, displacement, temperature, flexibility) can be independently configured through the parameter configuration interface, and the acquisition and display logic can be called in a unified manner;

[0126] Dual-system linkage: The acquisition end LabVIEW and the playback end PyQt are seamlessly connected, with unified file format and field standards, realizing data closure.

[0127] In summary, this system can be equipped with high-precision laser displacement and pressure sensors, enabling stable and accurate long-term detection of cell thickness (expansion displacement) and expansion force. The thickness detection position can be adjusted to detect thickness at any point within the cell. By integrating displacement and pressure sensors through a fixture assembly, and with a unified data acquisition box and processing platform, it can achieve high-precision, synchronous acquisition and real-time analysis of force, displacement, temperature, battery surface pressure distribution, and voltage and current in the battery charging and discharging system during battery expansion. Furthermore, it can perform four measurement modes for pouch batteries: free expansion measurement mode, constant pressure measurement mode, zero-gap measurement mode, and constant-gap measurement mode. The fixture assembly is also easy to use; it can be placed in an environmental chamber to evaluate the cell's expansion characteristics under different ambient temperatures.

[0128] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0129] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery swelling detection system, characterized in that, include: Fixture assembly, displacement sensor, pressure sensor (18), acquisition module and processing platform (20); The clamping assembly includes: a base (1), a guide rod assembly, an upper clamping plate (2), and a lower clamping plate (3); The guide rod assembly is disposed on the base (1) in a vertical direction; The upper clamping plate (2) and the lower clamping plate (3) are slidably disposed on the guide rod assembly and can slide up and down relative to the base (1); wherein, the upper clamping plate (2) and the lower clamping plate (3) are used to clamp the battery (14), and after the battery (14) is clamped, the upper clamping plate (2) is also used to place a counterweight to apply a preset pressure to the upper clamping plate (2), the preset pressure being less than the expansion force of the battery (14); The pressure sensor (18) is disposed between the lower clamping plate (3) and the base (1) and is used to detect the expansion force of the battery (14) in real time; The displacement sensor is disposed above the upper clamping plate (2) and is used to detect the displacement of the upper clamping plate (2) in real time; The acquisition module is used to acquire data from the displacement sensor and the pressure sensor (18) in real time; The processing platform (20) is used to process the data collected by the acquisition module from the displacement sensor and the pressure sensor (18), and to display the expansion force and expansion displacement of the battery (14).

2. The battery expansion detection system according to claim 1, characterized in that, The upper clamp (2) is used to place the battery (14); The clamp assembly also includes an adjustment bracket; The displacement sensor is positioned above the battery (14) via the adjustment bracket and is used to detect the expansion displacement of the battery (14) downwards in real time; wherein, the adjustment bracket can adjust the position of the displacement sensor detecting the battery (14).

3. The battery expansion detection system according to claim 2, characterized in that, The adjustment bracket includes: a support rod (4), a first cross arm (5), a second cross arm (6), and a mounting base (7); The support rod (4) is arranged vertically on one side of the base (1); One end of the first cross arm (5) is rotatably connected to the top end of the support rod (4); One end of the second cross arm (6) is rotatably connected to the other end of the first cross arm (5); The mounting base (7) is located at the other end of the second cross arm (6) and above the battery (14), and is used to mount the displacement sensor.

4. The battery expansion detection system according to claim 3, characterized in that, The first end face of the mounting base (7) is used to mount the displacement sensor, and the first end face of the mounting base (7) is provided with an assembly connection structure for cooperating with the displacement sensor.

5. The battery expansion detection system according to claim 1, characterized in that, The clamping assembly further includes: a first locking assembly and a second locking assembly; The first locking assembly is used to lock the upper clamping plate (2) to the guide rod assembly; The second locking assembly is used to lock the lower clamp (3) to the guide rod assembly.

6. The battery expansion detection system according to claim 5, characterized in that, The guide rod assembly includes multiple guide rods (8); Multiple guide rods (8) are respectively arranged vertically on the base (1) and are located at multiple corners of the base (1); The upper clamp (2) has multiple corners that pass through multiple guide rods (8) and can slide up and down along multiple guide rods (8); The lower clamping plate (3) has multiple corners that pass through multiple guide rods (8) and can slide up and down along multiple guide rods (8); The first locking assembly includes a plurality of first locking bolts (9) and is used to lock the plurality of corners of the upper clamping plate (2) to the plurality of guide rods (8). The second locking assembly includes a plurality of second locking bolts (10) and is used to lock the plurality of corners of the lower clamping plate (3) to the plurality of guide rods (8).

7. The battery expansion detection system according to claim 1, characterized in that, It also includes a temperature sensor (15) and a flexible pressure sensor (16). The temperature sensor (15) is used to attach to the battery (14) and to detect the temperature of the battery (14) in real time; The flexible pressure sensor (16) is used to attach to the battery (14) and to detect the surface pressure distribution of the battery (14) in real time. The acquisition module is also used to acquire data from the temperature sensor (15) and the flexible pressure sensor (16) in real time; The processing platform (20) is also used to process the data collected by the acquisition module from the temperature sensor (15) and the flexible pressure sensor (16), and to display the temperature curve and surface pressure distribution thermogram of the battery (14).

8. The battery expansion detection system according to claim 7, characterized in that, The acquisition module includes a data acquisition box (19); The data acquisition box (19) is used to synchronously acquire data from the displacement sensor, the pressure sensor (18), the temperature sensor (15), and the flexible pressure sensor (16); The processing platform (20) is used to process the data collected by the data acquisition box (19) from the displacement sensor, the pressure sensor (18), the temperature sensor (15) and the flexible pressure sensor (16), and to display the expansion force, expansion displacement, temperature curve and surface pressure distribution thermogram of the battery (14) in the interface partition.

9. The battery expansion detection system according to claim 8, characterized in that, The panel of the data acquisition box (19) has at least a displacement sensor port, a pressure sensor port, a temperature sensor port and a flexible pressure sensor port; The data acquisition box (19) also contains a data acquisition card and a signal conditioning module; The data acquisition card is connected to the displacement sensor port, the pressure sensor port, the temperature sensor port and the flexible pressure sensor port through multiple acquisition channels. The signal conditioning module is used to convert the signals of the displacement sensor, the pressure sensor (18) and the temperature sensor (15) into analog signals, and to convert the signal of the flexible pressure sensor (16) into serial port signals, so that the multiple acquisition channels of the data acquisition card can acquire them one by one.

10. The battery expansion detection system according to claim 8, characterized in that, The processing platform (20) is also used to replay the expansion force, expansion displacement, temperature curve and surface pressure distribution thermogram of the battery (14).

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