Square battery expansion volume measuring system

Abstract

The utility model provides a square battery expansion volume measuring system, which relates to the technical field of battery detection and comprises a square battery measuring groove, a plurality of shape follow-up piston devices and a laser emitting device. In the measuring groove, one end of the follow-up piston device abuts against the measuring face of the square battery, and the other end of the follow-up piston device is provided with a laser emitting device. When the measuring surface of the square battery deforms, the shape follow-up piston device can synchronously displace, and displacement data are obtained through the laser emitting device. According to the utility model, the plurality of shape follow-up piston devices are abutted against the measuring surface of the square battery, so that when the square battery expands in volume and deforms, the plurality of abutted shape follow-up piston devices can synchronously and correspondingly move according to the specific position of expansion deformation of the measuring surface; displacement data are obtained through the laser emitting device, the expansion volume measurement result is obtained through calculation, the method can be suitable for different types of square batteries, data corresponding to different deformation areas of the battery measurement face are obtained, and the obtained deformation volume is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, and more specifically to a square battery expansion volume measurement system. Background Art

[0002] With the advancement of energy storage technology, lithium-ion batteries are widely used in various energy systems, especially large-scale battery energy storage systems, due to their high energy density and long life. These systems often use large-capacity cells, such as 280Ah and 314Ah, to meet the growing demand for energy storage. The application of large lithium-ion batteries is not limited to mobile devices, but also extends to electric vehicles and large-scale energy storage power stations.

[0003] At present, large-scale energy storage lithium-ion batteries usually use metal aluminum as the battery shell material. Due to its good mechanical strength and flexibility, the metal aluminum shell can withstand the volume expansion and gas production during the battery operation to a certain extent. These phenomena are mainly caused by the volume expansion of the pole piece during the battery cycle, which leads to an increase in the internal pressure of the shell and may cause the shell to deform. The change in battery volume is an important indicator of battery status and health. Therefore, accurately measuring these changes is crucial for the optimization of battery management systems and the safe operation of batteries.

[0004] Nevertheless, the existing battery thickness measurement technology has certain limitations. At present, the measurement of battery thickness mainly relies on manual tools such as rulers or vernier calipers, or by applying constant pressure and evaluating the deformation of the battery through feedback from pressure and displacement sensors. These methods are not only complicated to operate, but also difficult to ensure the accuracy and repeatability of the measurement. For example, the caliper measurement method will inevitably have errors because it is difficult to ensure that the caliper is parallel to the measurement direction during the measurement process. In addition, the measurement test with a caliper is complicated; the pressurized test method requires that the battery be pressurized and then fed back to the pressure sensor and displacement sensor during the battery expansion process, which causes the battery expansion process to be affected by external forces. The measured battery thickness is less than the actual thickness of the battery. In addition, the pressurized test method can usually only measure the change of the maximum deformation point on a surface, which is not conducive to the calculation and understanding of the overall volume expansion of the battery.

[0005] In summary, existing measurement techniques are insufficient to provide comprehensive and precise information about the overall volume change of a battery. The operational complexity of manual measurement tools and the high requirements for technical proficiency limit their widespread application, while mechanical pressure testing methods may not accurately reflect the actual performance changes of the battery due to the limitations of the test settings. These technical limitations not only affect the evaluation and monitoring of battery performance, but may also pose risks to the safety and reliability of the battery. Therefore, the development of a new method that can accurately and comprehensively measure battery volume changes is of great significance to improving the safety and efficiency of battery systems. Utility Model Content

[0006] In order to solve the above defects, the utility model provides a square battery expansion volume measurement system, comprising: a measurement slot for placing the square battery to be measured, and a plurality of conformal piston devices and a laser emitting device corresponding to the conformal piston devices;

[0007] In the measuring groove, one end of the conformable piston device abuts against the measuring surface of the square battery, and the other end is provided with the laser emitting device;

[0008] When the measuring surface of the square battery is deformed, the conformal piston device abutting the measuring surface can be displaced synchronously, and displacement data is obtained by the laser emitting device, so as to obtain the expansion volume measurement result corresponding to the square battery according to the displacement data.

[0009] Preferably, the square battery expansion volume measurement system further comprises a first bracket plate;

[0010] The first bracket plate is placed in the measuring slot, perpendicular to the bottom surface of the measuring slot;

[0011] The conformable piston device is vertically connected to the first bracket plate and can move relative to the first bracket plate.

[0012] Preferably, the first bracket plate is provided with a plurality of displacement holes;

[0013] Each of the conformable piston devices is inserted into the corresponding displacement hole and can move in the horizontal direction relative to the displacement hole.

[0014] Preferably, the square battery expansion volume measurement system further comprises a second bracket plate;

[0015] The second bracket plate is arranged parallel to the first bracket plate;

[0016] The conformable piston device passes through the first bracket plate and is connected to the second bracket plate, and can move in a horizontal direction relative to the first bracket plate and the second bracket plate.

[0017] Preferably, the second bracket plate is provided with supporting holes;

[0018] The conformable piston device passes through one end of the first bracket plate and is inserted into the support hole.

[0019] Preferably, the longitudinal heights of the support hole and the displacement hole are the same;

[0020] The lateral width of the supporting hole is smaller than that of the displacement hole;

[0021] The conformable piston device comprises a piston cylinder and a plurality of ejection mechanisms arranged on the piston cylinder;

[0022] The shapes of the upper and lower ends of the cross section of the piston column body correspond to the shapes of the support hole and the displacement hole in the vertical direction;

[0023] The ejection mechanism includes a trigger button and a blocking member connected to the trigger button; the trigger button and the blocking member are arranged on both sides of the longitudinal section of the piston cylinder in the width direction;

[0024] The support hole is provided with a trigger protrusion on one side in the width direction; the position of the trigger protrusion corresponds to the position of the trigger button;

[0025] When the conformable piston device passes through the support hole, the trigger protrusion can abut against and trigger the trigger button, so that the blocking member pops out of the support hole;

[0026] After the blocking member pops out, the total width of the blocking member and the piston column is greater than the lateral width of the supporting hole.

[0027] Preferably, the ejection mechanism further includes a snap-on member;

[0028] The clamping member is arranged in the piston cylinder and can be clamped with the blocking member;

[0029] The trigger button abuts against the clamping member;

[0030] After the trigger button is triggered, it moves toward the inside of the piston column, so that the clamping member is disconnected from the blocking member, so that the blocking member can pop out after being separated from the clamping member.

[0031] Preferably, the friction coefficients between the conformable piston device and the support hole and the displacement hole when moving are no greater than 0.01.

[0032] Preferably, the square battery expansion volume measurement system comprises two first bracket plates and two second bracket plates which are symmetrically arranged;

[0033] The two first bracket plates and the two second bracket plates are respectively arranged on the front and rear sides of the square battery, respectively corresponding to the two measuring surfaces of the square battery;

[0034] On one side of each measuring surface of the square battery, the first bracket plate and the second bracket plate are arranged in parallel, and a plurality of conformal piston devices are provided to penetrate the displacement hole of the first bracket plate and the support hole of the second bracket plate.

[0035] Preferably, the square battery expansion volume measurement system further comprises a laser receiving device disposed in the measurement slot;

[0036] The laser receiving device corresponds to the laser emitting device and can receive the laser beam emitted by the laser emitting device.

[0037] The utility model provides a square battery expansion volume measurement system. It includes: a measurement slot for placing the square battery to be measured, and a plurality of conformal piston devices and a laser emitting device corresponding to the conformal piston device; in the measurement slot, one end of the conformal piston device abuts against the measurement surface of the square battery, and the other end is provided with the laser emitting device; when the measurement surface of the square battery is deformed, the conformal piston device abutting against the measurement surface can be displaced synchronously, and displacement data can be obtained through the laser emitting device, so as to obtain the expansion volume measurement result corresponding to the square battery according to the displacement data. The utility model abuts against the measurement surface of the square battery through a plurality of conformal piston devices. When the square battery expands in volume and deforms, the abutted plurality of conformal piston devices can move synchronously and correspondingly according to the specific position of the expansion and deformation of the measurement surface, and the displacement data can be obtained through the laser emitting device and the expansion volume measurement result can be calculated. The utility model can be applied to different types of square batteries, and can obtain data corresponding to different deformation areas of the battery measurement surface, so as to obtain the deformation volume more accurately, thereby avoiding the defect that the existing test method can only obtain the distance between battery points, which has the problem of huge measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the side cross-sectional structure of the square battery expansion volume measurement system of the utility model (before battery expansion);

[0039] Figure 2 This is a schematic diagram of the side cross-sectional structure of the square battery expansion volume measurement system of the utility model (after the battery expands);

[0040] Figure 3 This is a schematic diagram of the positional relationship between the first bracket plate and the second bracket plate in the square battery expansion volume measurement system of the utility model;

[0041] Figure 4 It is a schematic diagram of the three-dimensional structure of the first bracket plate and the second bracket plate in the square battery expansion volume measurement system of the utility model;

[0042] Figure 5 It is a structural schematic diagram of the conformal piston device (when the blocking member pops out) in the square battery expansion volume measurement system of the utility model;

[0043] Figure 6It is a schematic diagram of the positional relationship and structure of the conformable piston device when it is inserted into the support hole in the square battery expansion volume measurement system of the utility model;

[0044] Figure 7 It is a schematic cross-sectional structure diagram of the shaped piston device in the square battery expansion volume measurement system of the utility model before the trigger button is triggered;

[0045] Figure 8 It is a schematic cross-sectional structure diagram of the trigger button of the conformable piston device in the square battery expansion volume measurement system of the utility model after being triggered;

[0046] Fig. 9 The figure is a schematic diagram of the circuit connection of the central control device in the square battery expansion volume measurement system of the utility model.

[0047] Reference numerals:

[0048] 100, square battery expansion volume measurement system; 1, measuring slot; 2, conformal piston device; 21, piston cylinder; 22, pop-up mechanism; 221, trigger button; 222, blocking member; 223, snap-on member; 3, laser emitting device; 4, first bracket plate; 41, displacement hole position; 5, second bracket plate; 51, support hole position; 511, trigger protrusion; 6, laser receiving device; 7, central control device; 71, processor; 72, bus; 73, input module; 74, output module; 75, power supply module; 76, storage module; 200, square battery.

[0049] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] refer to Figure 1 The utility model provides a square battery expansion volume measurement system 100, comprising: a measurement slot 1 for placing a square battery 200 to be measured, and a plurality of conformal piston devices 2 and a laser emitting device 3 corresponding to the conformal piston device 2;

[0056] In the measuring tank 1, one end of the conformable piston device 2 abuts against the measuring surface of the square battery 200, and the other end is provided with the laser emitting device 3;

[0057] When the measuring surface of the square battery 200 is deformed, the conformable piston device 2 abutting the measuring surface can be displaced synchronously, and displacement data is obtained by the laser emitting device 3, so as to obtain the expansion volume measurement result corresponding to the square battery 200 according to the displacement data.

[0058] It should be noted that the present invention is directed to a square battery 200, also known as a square lithium-ion battery, which is a common battery packaging form and is widely used in various portable electronic devices, electric vehicles, energy storage systems and other fields.

[0059] Specifically, it may include but is not limited to the following:

[0060] (1) Hard shell aluminum shell square lithium battery: This type of battery usually uses aluminum material as the shell, which has good mechanical strength and thermal stability.

[0061] (2) Aluminum-plastic film soft-pack square lithium battery: Compared with hard-shell batteries, soft-pack batteries use aluminum-plastic composite film as the outer shell, which has higher energy density and design flexibility.

[0062] The square battery 200 can be provided with a measuring surface. For example, the square battery 200 is rectangular as a whole. During detection, a single measuring surface that needs to be detected can be set, or multiple measuring surfaces can be set, such as setting two front and back symmetrical measuring surfaces, namely the front and back sides, or setting four continuous measuring surfaces, four in the front, back, left and right, and setting six measuring surfaces, including the upper and lower surfaces. In addition, more measuring surfaces can be set according to their shape.

[0063] As mentioned above, the longitudinal direction of the conformable piston device 2 can be arranged perpendicular to the surface of the measuring surface. There can be multiple conformable piston devices 2, for example, 20 conformable piston devices 2 can be arranged corresponding to the measuring surface, so that multiple positions of the measuring surface can be detected more accurately.

[0064] refer to Figure 2 When the measuring surface is being tested, part of it may expand and deform. Multiple conformable piston devices 2 abut the measuring surface. When part of the measuring surface is deformed, their positions can change synchronously with the measuring surface. Therefore, in theory, the more conformable piston devices 2 there are, the higher the relative measurement accuracy.

[0065] The conformable piston device 2 may be a columnar structure, one end of which may abut against the measuring surface, and the other end of which is connected to a laser emitting device 3 .

[0066] As mentioned above, the laser emitting device 3 is used to emit laser to a plane position in the measuring slot 1, and obtain the laser beam through the sensor to determine the position change before and after the displacement, that is, the thickness of the battery cell at different positions is obtained by using the laser emitting device 3, and then the deformation of the large surface of the battery is fitted according to the thickness change of the obtained point using a related computer program, and then the deformation volume of the battery is calculated, which is the expansion volume measurement result.

[0067] As mentioned above, the measuring tank 1 can be a container for measurement, wherein a measuring position can be provided for placing the square battery 200, and the conformal piston device 2 is arranged near the measuring position, and the distance thereof is based on being able to contact the measuring surface.

[0068] Furthermore, the square battery expansion volume measurement system 100 further includes a first bracket plate 4;

[0069] The first bracket plate 4 is placed in the measuring slot 1, perpendicular to the bottom surface of the measuring slot 1;

[0070] The conformable piston device 2 is vertically connected to the first bracket plate 4 and can move relative to the first bracket plate 4 .

[0071] As mentioned above, the first support plate 4 is used to support each conformable piston device 2 in the longitudinal and vertical directions. With the support of the first support plate 4, the conformable piston device 2 can abut against the measuring surface and can move with respect to the square battery 200 when it is deformed.

[0072] In order to ensure that the conformable piston device 2 does not shake, fall or change direction when moving, which may cause inaccurate measurement results, the first bracket plate 4 must maintain a certain thickness so that the above situation will not occur when the conformable piston device 2 moves within a certain distance, thereby maintaining the stability of movement and the accuracy of direction.

[0073] Furthermore, the first bracket plate 4 is provided with a plurality of displacement holes 41;

[0074] Each of the conformable piston devices 2 is inserted into the corresponding displacement hole 41 and can move in the horizontal direction relative to the displacement hole 41 .

[0075] As mentioned above, a plurality of displacement holes 41 are provided in the first bracket plate 4, and each displacement hole 41 is correspondingly provided with a conformable piston device 2. One conformable piston device 2 is correspondingly penetrated in one displacement hole 41, and the conformable piston device 2 can always stay in the displacement hole 41 during movement, and move based on the displacement hole 41, so as to maintain the stability of movement and the accuracy of detection data acquisition.

[0076] For further reference, Figure 3 , the square battery expansion volume measurement system 100 also includes a second bracket plate 5;

[0077] The second bracket plate 5 is arranged parallel to the first bracket plate 4;

[0078] The conformable piston device 2 is connected to the second support plate 5 through the first support plate 4 and can move in a horizontal direction relative to the first support plate 4 and the second support plate 5 .

[0079] As mentioned above, when the conformable piston device 2 moves, a single first bracket plate 4 may shake to a certain extent, or even fall or tilt due to the length of the columnar body of the conformable piston device 2. In order to improve the accuracy and enable the test data to be acquired stably, in the utility model, a second bracket plate 5 is provided, which is arranged parallel to the first bracket plate 4 to improve the stability of the conformable piston device 2 during movement.

[0080] For a measuring surface, two support plates are set, namely a first support plate 4 at the proximal end and a second support plate 5 at the distal end. The second support plate 5 is set parallel to the first support plate 4. The conformal piston device 2 can pass through the two support plates and move in the horizontal direction between the two support plates. When moving, it will not separate from any support plate, maintaining the stability of movement.

[0081] For further reference, Figure 4 A three-dimensional structural diagram of the invention, wherein the second bracket plate 5 is provided with a support hole 51;

[0082] The conformable piston device 2 passes through one end of the first bracket plate 4 and is inserted into the supporting hole 51 .

[0083] As mentioned above, the support hole 51 is used to provide support when the conformable piston device 2 passes through. The shape of the support hole 51 is adapted to the shape of the cross section of the conformable piston device 2.

[0084] Furthermore, the support hole 51 and the displacement hole 41 have the same height in the longitudinal direction;

[0085] The lateral width of the support hole 51 is smaller than that of the displacement hole 41;

[0086] The conformable piston device 2 includes a piston cylinder 21 and a plurality of ejection mechanisms 22 disposed on the piston cylinder 21;

[0087] The shapes of the upper and lower ends of the cross section of the piston cylinder 21 correspond to the shapes of the support hole 51 and the displacement hole 41 in the vertical direction;

[0088] The ejection mechanism 22 includes a trigger button 221 and a blocking member 222 connected to the trigger button 221; the trigger button 221 and the blocking member 222 are arranged on both sides of the longitudinal section of the piston cylinder 21 in the width direction;

[0089] The support hole 51 is provided with a trigger protrusion 511 on one side in the width direction; the position of the trigger protrusion 511 corresponds to the position of the trigger button 221;

[0090] When the conformable piston device 2 passes through the support hole 51 , the trigger protrusion 511 can abut against and trigger the trigger button 221 , so that the blocking member 222 pops out of the support hole 51 ;

[0091] After the blocking member 222 pops out, the total width of the blocking member 222 and the piston cylinder 21 is greater than the lateral width of the supporting hole 51 .

[0092] It should be noted that when the conformable piston device 2 moves relative to the first bracket plate 4 and the second bracket plate 5, due to vibration, movement angle, change in battery shape, etc., it may move away from the battery and then retreat toward the battery, that is, the position retreats. For example, after the battery expands, the expanded area collapses, and the conformable piston device 2 retreats along with the collapse of the area. This situation will cause errors in the detection data, resulting in inaccurate and unstable data.

[0093] In order to avoid the above problems, in the present invention, the follow-up piston device 2 (reference Figure 5 ), the first bracket plate 4 and the second bracket plate 5 have been improved in structure accordingly.

[0094] First, the longitudinal heights of the displacement hole 41 of the first bracket plate 4 and the support hole 51 of the second bracket plate 5 are consistent, and both correspond to the cross-sectional height of the piston column 21 of the conformable piston device 2, so that the conformable piston device 2 can pass through the support hole 51 of the first bracket plate 4 and the displacement hole 41 of the second bracket plate 5.

[0095] In terms of the width of the hole, the support hole 51 is smaller than the displacement hole 41. The reason is that the inner displacement hole 41 provides support force for the conformable piston device 2 to avoid increasing unnecessary friction, while the outer support hole 51, in addition to providing support force for the conformable piston device 2, also needs to trigger the pop-up mechanism 22, so that after the pop-up mechanism 22 is triggered, it can form a limiting effect on the piston column 21 after passing through the support hole 51, resulting in the part of the piston column 21 after passing through the support hole 51 will not retreat.

[0096] Specifically, refer to Figure 6The pop-up mechanism 22 includes a trigger button 221 and a blocking member 222; the trigger button 221 and the blocking member 222 are respectively arranged on both sides of the longitudinal section of the piston column 21; for example, facing the longitudinal section, the left side is the trigger button 221, and the right side is the blocking member 222, wherein, inside the piston column 21, there are corresponding components in the pop-up mechanism 22 that play a certain elastic role, such as springs, shrapnel and other structures.

[0097] The inner circle of the support hole 51 is provided with a trigger protrusion 511, and the trigger protrusion 511 corresponds to the trigger button 221 in position. When the conformable piston device 2 passes through the support hole 51, the trigger protrusion 511 can contact the trigger button 221. Through the abutment, the trigger button 221 passing through the trigger protrusion 511 is triggered, so that the blocking member 222 connected thereto can pop up after the conformable piston device 2 passes through the support hole 51.

[0098] Before the blocking member 222 pops up, the total width of the longitudinal section of the conformable piston device 2 (the piston cylinder 21 + the blocking member 222 when retracted) is compatible with the size of the support hole 51, and can penetrate into or out of the support hole 51; however, after the blocking member 222 pops up, the total width of the cross-section of the conformable piston device 2 (the piston cylinder 21 + the popped-up blocking member 222) is greater than the support hole 51, causing the blocking member 222 to increase the total width of the cross-section of this part, thereby playing a limiting role and preventing the piston cylinder 21 from retreating.

[0099] Furthermore, the ejection mechanism 22 also includes a clamping member 223;

[0100] The clamping member 223 is disposed in the piston cylinder 21 and can be clamped with the blocking member 222;

[0101] The trigger button 221 abuts against the clamping member 223;

[0102] After the trigger button 221 is triggered, it moves inwardly of the piston cylinder 21 , so that the clamping member 223 is disconnected from the blocking member 222 , so that the blocking member 222 can be ejected outward after being separated from the clamping member 223 .

[0103] As mentioned above, the engaging member 223 in the ejection mechanism 22 is engaged with the blocking member 222 on one side and abuts against the trigger button 221 on the other side.

[0104] It can be seen that the pop-up mechanism 22 has the following two states:

[0105] (1)Reference Figure 7 , the trigger protrusion 511 is not in contact with the trigger button 221, the trigger button 221 is in contact with the clamping member 223 in the piston cylinder 21, and the clamping member 223 is clamped with the blocking member 222;

[0106] (2)Reference Figure 8 When the trigger protrusion 511 contacts the trigger button 221, the trigger button 221 is triggered. At this time, the trigger button 221 moves toward the inside of the piston column 21, thereby pushing the clamping member 223, giving the clamping member 223 a thrust from the outside of the piston column 21 to the center of the piston column 21. The clamping method of the clamping member 223 and the blocking member 222 can be a bite-engagement method, and the blocking member 222 is provided with a spring or spring sheet for popping out to generate an outward elastic force.

[0107] refer to Figure 8 The trigger button 221 moves into the piston cylinder 21 and contacts the clamping member 223, causing the clamping member 223 to move (from outside to inside), and releasing the connection between the clamping member 223 and the blocking member 222, causing the blocking member 222 to detach from the clamping member 223 and pop outward under the action of the spring or spring therein.

[0108] For example, a slideway parallel to the length direction of the piston cylinder 21 is provided in the clamping member 223, and the clamping member 223 is arranged on the slideway and can move forward and backward. The clamping member 223 is connected with a spring and can return to the original position after moving backward.

[0109] After the trigger button 221 abuts against the clamping member 223, the clamping member 223 moves away from the square battery 200, and the clamping engagement position between the clamping member 223 and the blocking member 222 is disengaged, causing the blocking member 222 to detach from the clamping member 223 without being clamped and fixed, and pop out under the action of its corresponding spring or elastic sheet.

[0110] The blocking member 222 , the clamping member 223 , and the trigger button 221 may all be connected with springs, spring sheets, and elastic members, so as to provide elasticity for them to return to their original positions.

[0111] Furthermore, the friction coefficients between the conformable piston device 2 and the support hole 51 and the displacement hole 41 when moving are no greater than 0.01.

[0112] Under a specific friction coefficient, the conformable piston device 2 can slide smoothly between the two holes without causing errors in the detection data due to excessive friction.

[0113] Furthermore, the square battery expansion volume measurement system 100 includes two first bracket plates 4 and two second bracket plates 5 that are symmetrically arranged;

[0114] The two first bracket plates 4 and the two second bracket plates 5 are respectively arranged on the front and rear sides of the square battery 200, respectively corresponding to the two measuring surfaces of the square battery;

[0115] On one side of each measuring surface of the square battery 200 , the first bracket plate 4 and the second bracket plate 5 are arranged in parallel, and a plurality of conformal piston devices 2 are provided to penetrate the displacement hole 41 of the first bracket plate 4 and the support hole 51 of the second bracket plate 5 .

[0116] As mentioned above, in order to detect the detection surfaces on the front and rear sides of the square battery 200, two sets of bracket plates are provided accordingly.

[0117] Furthermore, the square battery expansion volume measurement system 100 further includes a laser receiving device 6 disposed in the measurement tank 1;

[0118] The laser receiving device 6 corresponds to the laser emitting device 3 and can receive the laser beam emitted by the laser emitting device 3 .

[0119] A laser receiving device 6 is also provided in the measuring tank 1. Each laser emitting device 3 is provided with a corresponding laser receiving device 6 for receiving the laser beam and obtaining detection data.

[0120] As mentioned above, the principle adopted by the square battery expansion volume measurement system 100 is optical measurement technology. Specifically, it uses a laser ranging method to monitor the volume expansion of the battery caused by changes in internal pressure during charging and discharging or other use processes.

[0121] The principle is that when the measuring surface of the square battery 200 (i.e., the surface protruding when the battery expands) is deformed, the conformal piston device 2 directly in contact with the measuring surface will also be displaced. This displacement change can be measured by the laser emitting device 3 corresponding to the piston device. The laser emitting device 3 emits a laser beam, which is received by the laser receiving device 6 on the opposite side.

[0122] Each laser emitting device 3 is provided with a corresponding laser receiving device 6, and its function is that each laser emitting device 3 corresponds to a fixed laser receiving device 6, and these receiving devices are placed in a fixed position relative to the emitting device. When the piston device moves due to the expansion of the battery volume, the emitting device will also move with it, resulting in a change in the emission angle or distance of the laser beam. The change in the laser signal received by the laser receiving device 6 (such as the arrival phase difference, distance difference, etc.) can be used to calculate the distance moved by the laser emitting device 3.

[0123] The purpose of setting up a fixed laser receiving device 6 is to ensure that each measurement is carried out under the same conditions through the fixed receiving device, thereby improving the accuracy and repeatability of the measurement. The movement of the laser emitting device 3 causes the received laser signal to change. By accurately measuring this change, the distance data of the displacement of the piston device can be obtained. The fixed laser receiving device 6 can provide a stable reference point, which is convenient for the system to calculate the displacement distance by comparing the data before and after the emission. The fixed device enables the system to monitor the change in battery volume in real time, which is crucial for studying the thermodynamic properties and safety of the battery. By measuring the displacement distance of the piston device, combined with the size and other parameters of the battery, the volume change of the battery expansion can be calculated.

[0124] This measurement method can accurately monitor the volume changes of batteries under different working conditions, which is of great significance for battery quality management, performance evaluation and life prediction.

[0125] In summary, this measurement method achieves accurate and real-time monitoring of battery volume expansion through fixed coordination of laser emission and reception, which is of great value for battery performance research and quality control.

[0126] For further reference, Fig. 9 , the square battery expansion volume measurement system 100 also includes a central control device 7;

[0127] The central control device 7 includes a processor 71 and a bus 72, as well as an input module 73, an output module 74, a power supply module 75 and a storage module 76 connected to the processor via the bus 72;

[0128] The laser emitting device 3 and the laser receiving device 6 are both electrically connected to the processor 71 via the bus 72 .

[0129] As mentioned above, the processor 71 is the CPU, and the bus 72 is the motherboard. The input module 73, the output module 74, the power supply module 75 and the storage module 76 are all hardware devices, wherein the input module 73 can be a device related to input control, for example, a keyboard, a mouse, a joystick, a button, a rocker, a knob, a toggle switch, etc.; the output module 74 can be a display, a display screen, a touch screen, a speaker, a meter, etc. for displaying relevant information; the power supply module 75 can be direct current or alternating current, for example, directly connected to a lithium-ion battery; the storage module 76 can include but is not limited to a solid state drive, a mechanical hard drive, a storage card, a memory card, a network disk, and related storage space in a cloud server, etc.

[0130] In addition, the central control device 7 may be provided with a network module, such as a network adapter, which can be connected to the Internet via a wired or wireless method, and can acquire and calculate data via a mobile smart device.

[0131] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A square battery expansion volume measurement system, It is characterized in that include: A measuring slot for placing a square battery to be tested, and a plurality of conformal piston devices and a laser emitting device corresponding to the conformal piston devices; In the measuring groove, one end of the conformable piston device abuts against the measuring surface of the square battery, and the other end is provided with the laser emitting device; When the measuring surface of the square battery is deformed, the conformal piston device abutting the measuring surface can be displaced synchronously, and displacement data is obtained by the laser emitting device, so as to obtain the expansion volume measurement result corresponding to the square battery according to the displacement data.

2. The square battery expansion volume measurement system as claimed in claim 1, It is characterized in that The square battery expansion volume measurement system also includes a first bracket plate; The first bracket plate is placed in the measuring slot, perpendicular to the bottom surface of the measuring slot; The conformable piston device is vertically connected to the first bracket plate and can move relative to the first bracket plate.

3. The square battery expansion volume measurement system as claimed in claim 2, It is characterized in that The first bracket plate is provided with a plurality of displacement holes; Each of the conformable piston devices is inserted into the corresponding displacement hole and can move in the horizontal direction relative to the displacement hole.

4. The square battery expansion volume measurement system as claimed in claim 3, It is characterized in that The square battery expansion volume measurement system also includes a second bracket plate; The second bracket plate is arranged parallel to the first bracket plate; The conformable piston device passes through the first bracket plate and is connected to the second bracket plate, and can move in a horizontal direction relative to the first bracket plate and the second bracket plate.

5. The square battery expansion volume measurement system as claimed in claim 4, It is characterized in that The second bracket plate is provided with a supporting hole; the conformable piston device passes through one end of the first bracket plate and is inserted into the supporting hole.

6. The square battery expansion volume measurement system as claimed in claim 5, It is characterized in that The support hole position and the displacement hole position have the same longitudinal height; The lateral width of the supporting hole is smaller than that of the displacement hole; The conformable piston device comprises a piston cylinder and a plurality of ejection mechanisms arranged on the piston cylinder; The shapes of the upper and lower ends of the cross section of the piston column body correspond to the shapes of the support hole and the displacement hole in the vertical direction; The ejection mechanism includes a trigger button and a blocking member connected to the trigger button; the trigger button and the blocking member are arranged on both sides of the longitudinal section of the piston cylinder in the width direction; The support hole is provided with a trigger protrusion on one side in the width direction; the position of the trigger protrusion corresponds to the position of the trigger button; When the conformable piston device passes through the support hole, the trigger protrusion can abut against and trigger the trigger button, so that the blocking member pops out of the support hole; After the blocking member pops out, the total width of the blocking member and the piston column is greater than the lateral width of the supporting hole.

7. The square battery expansion volume measurement system as claimed in claim 6, It is characterized in that The ejection mechanism further includes a snap-in component; The clamping member is arranged in the piston cylinder and can be clamped with the blocking member; The trigger button abuts against the clamping member; After the trigger button is triggered, it moves toward the inside of the piston column, so that the clamping member is disconnected from the blocking member, so that the blocking member can pop out after being separated from the clamping member.

8. The square battery expansion volume measurement system as claimed in claim 5, It is characterized in that The friction coefficients between the conformable piston device and the support hole and the displacement hole when moving are no greater than 0.

01.

9. The square battery expansion volume measurement system as claimed in claim 5, It is characterized in that The square battery expansion volume measurement system comprises two first bracket plates and two second bracket plates which are symmetrically arranged; The two first bracket plates and the two second bracket plates are respectively arranged on the front and rear sides of the square battery, respectively corresponding to the two measuring surfaces of the square battery; On one side of each measuring surface of the square battery, the first bracket plate and the second bracket plate are arranged in parallel, and a plurality of conformal piston devices are provided to penetrate the displacement hole of the first bracket plate and the support hole of the second bracket plate.

10. The square battery expansion volume measurement system as claimed in claim 1, It is characterized in that The square battery expansion volume measurement system also includes a laser receiving device disposed in the measurement slot; The laser receiving device corresponds to the laser emitting device and can receive the laser beam emitted by the laser emitting device.

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