An automatically adjustable measuring instrument

Abstract

The utility model discloses a kind of automatically regulated measuring instrument, the measuring instrument includes: mutually parallel first parallel surface pressboard and second parallel surface pressboard, first force pressboard located above first parallel surface pressboard, second force pressboard located below second parallel surface pressboard, and vertically connect first force pressboard, second force pressboard, and drive first force pressboard, second force pressboard relative motion's position adjusting mechanism;First parallel surface pressboard is fixed on first force pressboard by first pressure sensor connection, and second parallel surface pressboard is fixed on second force pressboard by second pressure sensor connection. The measuring instrument structure design is simple, appearance volume is small and exquisite, working temperature is extensive, can be under the premise of guaranteeing parallelism, pressure precision, thickness precision, realize the constant pressure thickness measurement in the process of battery charging and discharging, constant gap force measurement and its mixed working mode under online measurement.

Description

Technical Field

[0001] This utility model relates to the field of battery measurement technology, and in particular to an automatically adjustable measuring instrument. Background Technology

[0002] Soft-pack lithium batteries are the third generation of power lithium batteries developed based on the original steel-cased, aluminum-cased, and plastic-cased batteries. With their advantages such as being lighter and thinner, having a longer cycle life, better safety performance, higher energy density, more stable discharge platform, better power performance, and being environmentally friendly and pollution-free, they are widely used in manufacturing, metal processing, chemical industry, commodity inspection and other fields.

[0003] In recent years, the lithium-ion battery industry has experienced rapid development. In actual use, the battery cell is confined within the module, and the thickness changes during charging and discharging cause expansion forces that directly affect the electrical performance, safety, and reliability of the cell, module, and battery pack. In research and manufacturing, the offline detection of in-situ cell thickness and expansion forces has been challenged by the need for online monitoring. Higher requirements have been placed on current traditional solutions regarding parallelism, pressure accuracy, and thickness accuracy. Furthermore, product development has necessitated functional requirements for constant pressure thickness measurement, constant gap force measurement, and hybrid modes. Summary of the Invention

[0004] The present invention aims to at least solve the technical problems existing in the prior art. To this end, the first aspect of the present invention provides an automatically adjustable measuring instrument, comprising: The first parallel surface pressure plate and the second parallel surface pressure plate are parallel to each other, the first force-bearing pressure plate is located above the first parallel surface pressure plate, the second force-bearing pressure plate is located below the second parallel surface pressure plate, and the position adjustment mechanism is vertically connected to the first force-bearing pressure plate and the second force-bearing pressure plate and drives the first force-bearing pressure plate and the second force-bearing pressure plate to move relative to each other. The first parallel surface pressure plate is connected and fixed to the first force-bearing pressure plate through a first pressure sensor, and the second parallel surface pressure plate is connected and fixed to the second force-bearing pressure plate through a second pressure sensor; The number of the position adjustment mechanisms is three or more, and they are not installed in a straight line; Multiple displacement detection mechanisms 7 are respectively installed on the first parallel surface pressure plate and the second parallel surface pressure plate to detect the displacement and gap of the first parallel surface pressure plate and the second parallel surface pressure plate; The measuring instrument also includes a controller and a host computer management system. The controller is electrically connected to the motor of the position adjustment mechanism, the pressure sensor, and the displacement detection mechanism, and is communicatively connected to the host computer management system.

[0005] Optionally, the first parallel surface pressure plate and the second parallel surface pressure plate have the same shape and size, and the first force-bearing pressure plate and the second force-bearing pressure plate have the same shape and size.

[0006] Optionally, the displacement detection mechanism includes a displacement sensor, a displacement ruler, and a displacement reading head. The displacement ruler is fixed on the first parallel surface pressure plate, the displacement reading head is fixed on the second parallel surface pressure plate, and the displacement sensor is connected to the controller.

[0007] Optionally, the number of the position adjustment mechanisms is three sets, the first parallel surface pressure plate and the second parallel surface pressure plate are both triangular, and the three sets of position adjustment mechanisms are respectively vertically connected to the three vertices of the first parallel surface pressure plate and the second parallel surface pressure plate.

[0008] Optionally, the position adjustment mechanism is a lead screw assembly, which includes a lead screw support structure, a motor, a lead screw, a lead screw nut, a first elastic connector, and a second elastic connector. The lead screw support structure is connected and fixed to the first pressure plate via a first elastic connector, and the fixed end of the lead screw nut is connected and fixed to the second pressure plate via a second elastic connector.

[0009] Optionally, both the first parallel surface pressure plate and the second parallel surface pressure plate are made of marble.

[0010] Optionally, the controller integrates a motor drive module and motion control algorithm, a pressure and displacement acquisition module, a constant pressure thickness measurement algorithm, a constant gap force measurement algorithm, an elastic gap algorithm, an automatic leveling algorithm, an offline mode and data storage function, and a 485 communication protocol; The host computer management system realizes measurement and control functions through human-computer interaction and network communication with the controller.

[0011] The above solution has the following beneficial effects: The automatically adjustable measuring instrument provided in this embodiment includes: a first parallel surface pressure plate and a second parallel surface pressure plate that are parallel to each other; a first force-bearing pressure plate located above the first parallel surface pressure plate; a second force-bearing pressure plate located below the second parallel surface pressure plate; and a position adjustment mechanism that vertically connects the first force-bearing pressure plate and the second force-bearing pressure plate and drives the first force-bearing pressure plate and the second force-bearing pressure plate to move relative to each other. The first parallel surface pressure plate is connected and fixed to the first force-bearing pressure plate through a first pressure sensor, and the second parallel surface pressure plate is connected and fixed to the second force-bearing pressure plate through a second pressure sensor. The number of position adjustment mechanisms is three or more, and they are not distributed and installed in a straight line. Multiple displacement detection mechanisms are respectively installed on the first parallel surface pressure plate and the second parallel surface pressure plate for detecting the displacement and gap of the first parallel surface pressure plate and the second parallel surface pressure plate. The measuring instrument also includes a controller and a host computer management system. The controller is electrically connected to the motor of the position adjustment mechanism, the pressure sensor, and the displacement detection mechanism, and the controller is communicatively connected to the host computer management system. This measuring instrument features a simple structure, compact size, and wide operating temperature range. It enables online measurement of battery cells under constant pressure and constant gap conditions during charging and discharging processes, while ensuring parallelism, pressure accuracy, and thickness accuracy. This provides support for battery cell material development, structural design, process optimization, and related mechanism research, and offers reliable structural parameters for module and battery pack design. Attached Figure Description

[0012] Figure 1 A three-dimensional perspective view of an automatically adjustable measuring instrument provided for an embodiment of this utility model; Figure 2 A front view of an automatically adjustable measuring instrument provided for an embodiment of this utility model; Figure 3 This is a top view of a triangular parallel-surface pressure plate provided in an embodiment of the present utility model. Detailed Implementation

[0013] 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.

[0014] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more of the stated conditions or values ​​may in practice be based on additional conditions or beyond the stated values.

[0015] Figure 1 A three-dimensional view of an automatically adjustable measuring instrument provided for an embodiment of this utility model.

[0016] Figure 2 A front view of an automatically adjustable measuring instrument provided for an embodiment of this utility model.

[0017] like Figure 1 , Figure 2 As shown, the measuring instrument includes: The first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are parallel to each other, the first force-bearing pressure plate 3 is located above the first parallel surface pressure plate 1, the second force-bearing pressure plate 4 is located below the second parallel surface pressure plate 2, and the position adjustment mechanism 5 is vertically connected to the first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 and drives the first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 to move relative to each other. The first parallel surface pressure plate 1 is connected and fixed to the first force-bearing pressure plate 3 through the first pressure sensor 8, and the second parallel surface pressure plate 2 is connected and fixed to the second force-bearing pressure plate 4 through the second pressure sensor 9; The number of the position adjustment mechanism 5 is three or more, and they are not installed in a straight line; Multiple displacement detection mechanisms 7 are respectively installed on the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 to detect the displacement and gap of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2; The measuring instrument also includes a controller 6 and a host computer management system. The controller 6 is electrically connected to the motor of the position adjustment mechanism 5, the pressure sensor, and the displacement monitoring mechanism. The controller 6 is communicatively connected to the host computer management system.

[0018] In this embodiment of the utility model, the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 constitute a parallel panel pressure and thickness measuring mechanism. Specifically, the parallelism of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 is controlled by controlling the gap between at least three points that are not on a straight line.

[0019] The object to be tested is placed between the first pressure plate 3 and the second pressure plate 4. The position adjustment mechanism 5 can control the first pressure plate 3 and the second pressure plate 4 to move up and down. The displacement detection mechanism 7 is used to detect the size of the gap between the first pressure plate 3 and the second pressure plate 4 so that the gap reaches the target gap value, thereby realizing constant gap force measurement.

[0020] The displacement detection mechanism 7 can detect the change in the distance between the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 in the vertical direction, and can also determine the parallelism of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 through multi-point detection data.

[0021] The displacement detection mechanism 7 is installed at the ends of the first pressure plate 3 and the second pressure plate 4. It can be close to the installation position of the position adjustment mechanism 5, and the number of the mechanism can be the same as the number of the position adjustment mechanism 5, so as to accurately detect the change in displacement after position adjustment.

[0022] The first parallel surface pressure plate 1 is connected and fixed to the first force-bearing pressure plate 3 through the first pressure sensor 8, and the second parallel surface pressure plate 2 is connected and fixed to the second force-bearing pressure plate 4 through the second pressure sensor 9. In this way, the first pressure sensor 8 can detect the pressure on the first force-bearing pressure plate 3, and the second pressure sensor 9 can detect the pressure on the second force-bearing pressure plate 4.

[0023] The object to be measured is placed between the first pressure plate 3 and the second pressure plate 4. The position adjustment mechanism 5 controls the first pressure plate 3 and the second pressure plate 4 to move up and down so that the pressure readings of both reach the target pressure value, thereby achieving constant pressure thickness measurement.

[0024] The host computer management system can issue constant pressure thickness measurement command or constant gap force measurement command to the controller 6. The controller 6 is connected to the motors of the pressure sensor, displacement detection mechanism 7, and position adjustment mechanism 5 respectively. The controller 6 controls the motor of the position adjustment mechanism 5 to work according to the measurement command, so as to realize the up and down movement of the position adjustment mechanism 5.

[0025] The controller 6 receives the pressure reading from the pressure sensor and the displacement reading from the displacement detection mechanism 7. Based on the pressure reading and displacement reading, it determines whether constant pressure or constant clearance has been achieved. When it is determined that it has been achieved, it acquires the readings of the corresponding sensors and obtains the measured values.

[0026] The number of position adjustment mechanisms 5 is three or more, and they are not installed in a straight line. According to the principle of three points determining one surface, when the number of position adjustment mechanisms is three or more, the three position adjustment mechanisms move up and down at the same time, so that the displacement of each position of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 is the same, thereby ensuring that the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are always in a parallel state.

[0027] As an optional embodiment, the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 have the same shape and size, and the first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 have the same shape and size.

[0028] The first parallel pressure plate 1 and the second parallel pressure plate 2 have the same shape and size. The first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 have the same shape and size, which can ensure that the force and displacement are the same under the same conditions, and reduce system error.

[0029] As an optional embodiment, the displacement detection mechanism 7 includes a displacement ruler and a displacement reading head, wherein the displacement ruler is fixed on the first parallel surface pressure plate and the displacement reading head is fixed on the second parallel surface pressure plate.

[0030] The displacement scale is typically an optical or magnetic scale, a precision linear encoder scale, fixed to the first parallel surface pressure plate by bolts or adhesive. The displacement reading head is an optical or magnetic induction sensor that reads the scale signal in real time and is mounted on the second parallel surface pressure plate. A certain gap is maintained between the sensor and the displacement scale to avoid mechanical contact and friction.

[0031] As an optional embodiment, the number of the position adjustment mechanism 5 is three sets, the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are both triangular, and the three sets of position adjustment mechanisms 5 are respectively vertically connected to the three vertices of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2.

[0032] Any three non-collinear points can precisely define a plane. When there are three sets of position modulation mechanisms, the three sets of position modulation mechanisms move up and down simultaneously, so that the displacement of each position of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 is the same, thereby ensuring that the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are always in a parallel state.

[0033] Figure 3 This is a top view of a triangular parallel-surface pressure plate provided in an embodiment of the present utility model.

[0034] like Figure 3 As shown, the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are both triangular, and three position adjustment mechanisms 5 are installed at the three vertices of the triangular pressure plates to ensure that the adjustment force is evenly distributed at 120° and to avoid torque imbalance.

[0035] When the number of position adjustment mechanisms 5 is 4 or more, the position adjustment mechanisms 5 can also be distributed at the apex of the pressure plate to ensure force balance.

[0036] As an optional embodiment, the position adjustment mechanism 5 is a lead screw assembly, which includes a lead screw support structure, a motor, a lead screw 51, a lead screw nut 52, a first elastic connector 53, and a second elastic connector 54. The lead screw support structure is connected and fixed to the first pressure plate 3 via the first elastic connector 53, and the fixed end of the lead screw nut 52 is connected and fixed to the second pressure plate 4 via the second elastic connector 54.

[0037] In this embodiment of the invention, the lead screw support structure is a mechanical frame used to fix and support the lead screw, typically including a bearing seat or support seat to ensure stable rotation of the lead screw. The motor is the power source driving the rotation of the lead screw, and is typically directly connected to the lead screw via a coupling. The lead screw 51 is a precision screw with helical grooves, which transmits motion to the lead screw nut 52 during rotation. The lead screw nut 52 is a nut that meshes with the lead screw, converting the rotational motion of the lead screw 52 into linear motion.

[0038] The first elastic connector 53 connects the lead screw support structure to the first pressure plate 3, allowing the support structure to undergo slight elastic deformation under stress, thus buffering or compensating for assembly errors. The second elastic connector 54 connects the fixed end of the nut to the second pressure plate 4, so that the linear motion of the nut is transmitted to the pressure plate with flexibility, avoiding rigid impact or over-constraint.

[0039] In this way, while the motor drives the lead screw 51 to rotate, the lead screw nut 52 moves along the lead screw axis, pushes the first force-bearing plate 3 to move through the first elastic connector 53, and pushes the second force-bearing plate 4 to move through the second elastic connector 54, thereby realizing position adjustment.

[0040] As an optional embodiment, both the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are made of marble.

[0041] Marble has an extremely low coefficient of thermal expansion and almost zero deformation over time, which can ensure the parallelism of the first parallel pressure plate 1 and the second parallel pressure plate 2. It also has excellent vibration damping characteristics, which can absorb the vibration brought by the position adjustment mechanism 5 and reduce the risk of equipment resonance.

[0042] As an optional embodiment, the controller 6 integrates a motor drive module and motion control algorithm, a pressure and displacement acquisition module, a constant pressure thickness measurement algorithm, a constant gap force measurement algorithm, an elastic gap algorithm, an automatic leveling algorithm, an offline mode and data storage function, and a 485 communication protocol; The host computer management system realizes measurement and control functions through human-computer interaction and network communication with the controller 6.

[0043] In this embodiment of the invention, the motor and motion control algorithm of the controller 6 are mainly used to drive the motor to move the position adjustment module up and down according to the instructions sent by the host computer management system, thereby controlling the motion of the position adjustment module. The pressure and displacement acquisition module mainly collects the pressure value of the pressure sensor and the displacement value of the displacement detection module. The constant pressure thickness measurement algorithm and the constant gap force measurement algorithm are used to control the up and down movement of the position adjustment module to achieve constant pressure or constant gap, so as to measure the thickness or force of the object to be measured.

[0044] The constant gap mode includes two modes: rigid gap and elastic gap. The rigid gap mode is based on the principle and method adopted in this invention, which enables high-precision detection of the product under test and eliminates system measurement errors caused by structural deformation.

[0045] The elastic gap is a systematic error caused by the deformation of the traditional device mechanism. The principle and method adopted by this utility model only has a rigid gap. In order to simulate the elastic gap, an elastic coefficient factor is introduced through software algorithm. The factor is revised according to the test sample of the benchmark product, thereby achieving close consistency with the measurement system of the benchmark product and realizing the elastic gap algorithm.

[0046] The automatic leveling algorithm mainly refers to the simultaneous up-and-down movement of three or more sets of position modulation mechanisms, so that the displacement of each position of the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 is the same, thereby ensuring that the first parallel surface pressure plate 1 and the second parallel surface pressure plate 2 are always in a parallel state.

[0047] This invention relates to a measurement method for monitoring the thickness and pressure of a battery cell during charging and discharging, i.e., an online measurement method. Furthermore, the constant pressure thickness measurement method of this application is also applicable to offline measurement, i.e., measuring the thickness of the battery cell when it is not charging or discharging.

[0048] The data storage function of this utility model refers to its ability to store thickness measurement data and force measurement data.

[0049] The controller 6 and the host computer management system communicate using the 485 communication protocol.

[0050] This utility model discloses an automatically adjustable measuring instrument that can automatically level, adjust pressure, adjust gap, and automatically collect pressure and gap data. It features a simple structural design, compact size, and wide operating temperature range. While ensuring parallelism, pressure accuracy, and thickness accuracy, it can achieve online measurement in constant pressure thickness measurement, constant gap force measurement, and hybrid operating modes during the charging and discharging processes of battery cells. The instruments can be used to measure electrode materials, coin cells, single-layer laminated cells, pouch cells, and prismatic cells, providing support for cell material development, structural design, process optimization, and related mechanism research, as well as providing reliable structural parameters for module and battery pack design.

[0051] In summary, the automatically adjustable measuring instrument provided by this utility model embodiment includes: a first parallel surface pressure plate 1 and a second parallel surface pressure plate 2 that are parallel to each other; a first force-bearing pressure plate 3 located above the first parallel surface pressure plate 1; a second force-bearing pressure plate 4 located below the second parallel surface pressure plate 2; and a position adjustment mechanism 5 that vertically connects the first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 and drives the first force-bearing pressure plate 3 and the second force-bearing pressure plate 4 to move relative to each other; the first parallel surface pressure plate 1 is connected and fixed to the first force-bearing pressure plate 3 via a first pressure sensor 8; the second parallel surface pressure plate 2 is connected and fixed to the first force-bearing pressure plate 3 via a second pressure sensor 8. Pressure sensor 9 is fixedly connected to the second force-bearing plate 4; the number of position adjustment mechanisms 5 is three or more, and they are not distributed in a straight line; multiple displacement detection mechanisms 7 are respectively installed on the first parallel surface plate 1 and the second parallel surface plate 2 to detect the displacement and gap of the first parallel surface plate 1 and the second parallel surface plate 2; the measuring instrument also includes a controller 6 and a host computer management system. The controller 6 is electrically connected to the motor of the position adjustment mechanism 5, the pressure sensor, and the displacement detection mechanism 7, and the controller 6 is communicatively connected to the host computer management system. This measuring instrument has a simple structural design, small size, and wide operating temperature range. It can achieve online measurement of constant pressure thickness measurement, constant gap force measurement, and their mixed working modes during the charging and discharging process of battery cells, while ensuring parallelism, pressure accuracy, and thickness accuracy. It provides support for battery cell material development, structural design, process optimization, and related mechanism research, and provides reliable structural parameters for module and battery pack design.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An automatically adjustable measuring instrument, characterized in that, include: The first parallel surface pressure plate and the second parallel surface pressure plate are parallel to each other, the first force-bearing pressure plate is located above the first parallel surface pressure plate, the second force-bearing pressure plate is located below the second parallel surface pressure plate, and the position adjustment mechanism is vertically connected to the first force-bearing pressure plate and the second force-bearing pressure plate and drives the first force-bearing pressure plate and the second force-bearing pressure plate to move relative to each other. The first parallel surface pressure plate is connected and fixed to the first force-bearing pressure plate through a first pressure sensor, and the second parallel surface pressure plate is connected and fixed to the second force-bearing pressure plate through a second pressure sensor; The number of the position adjustment mechanisms is three or more, and they are not installed in a straight line; Multiple displacement detection mechanisms (7) are respectively installed on the first parallel surface pressure plate and the second parallel surface pressure plate to detect the displacement and gap of the first parallel surface pressure plate and the second parallel surface pressure plate; The measuring instrument also includes a controller and a host computer management system. The controller is electrically connected to the motor of the position adjustment mechanism, the pressure sensor, and the displacement detection mechanism, and is communicatively connected to the host computer management system.

2. The gauge of claim 1, wherein, The first parallel surface pressure plate and the second parallel surface pressure plate have the same shape and size, and the first force-bearing pressure plate and the second force-bearing pressure plate have the same shape and size.

3. The gauge of claim 1, wherein, The displacement detection mechanism includes a displacement sensor, a displacement ruler, and a displacement reading head. The displacement ruler is fixed on the first parallel surface pressure plate, the displacement reading head is fixed on the second parallel surface pressure plate, and the displacement sensor is connected to the controller.

4. The gauge of claim 1, wherein, The number of the position adjustment mechanism is three sets. The first parallel surface pressure plate and the second parallel surface pressure plate are both triangular. The three sets of position adjustment mechanisms are vertically connected to the three vertices of the first parallel surface pressure plate and the second parallel surface pressure plate, respectively.

5. The gauge of claim 1, wherein, The position adjustment mechanism is a lead screw assembly, which includes a lead screw support structure, a motor, a lead screw, a lead screw nut, a first elastic connector, and a second elastic connector. The lead screw support structure is connected and fixed to the first pressure plate via a first elastic connector, and the fixed end of the lead screw nut is connected and fixed to the second pressure plate via a second elastic connector.

6. The gauge of claim 1, wherein, Both the first parallel surface pressure plate and the second parallel surface pressure plate are made of marble.

7. The gauge of claim 1, wherein, The controller integrates a motor drive module and motion control algorithm, pressure and displacement acquisition module, constant pressure thickness measurement algorithm, constant gap force measurement algorithm, elastic gap algorithm, automatic leveling algorithm, offline mode and data storage function, and 485 communication protocol; The host computer management system realizes measurement and control functions through human-computer interaction and network communication with the controller.

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