Patent Description:
Batteries are widely used in the field of new energy, such as electric vehicles and new-energy vehicles. New-energy vehicles and electric vehicles have become a new trend in development of the automotive industry. A battery cell includes an electrode assembly, and the electrode assembly is a component, where an electrochemical reaction occurs, in the battery cell. The electrode assembly is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate. However, the yield in production of electrode plates at present is low. <CIT> relates to a battery pole piece die cutting and slitting all-in-one machine. <CIT> relates to a pole piece rolling, slitting and processing system. <CIT> relates to a pole piece detecting equipment.

Embodiments of the present application are intended to provide a measurement device as specified in claims <NUM>-<NUM> and an electrode plate production system as specified in claim <NUM>, aiming to solve the problem of low yield in production of electrode plates in the prior art.

In a first aspect, embodiments of the present application provide a measurement device. The measurement device includes an unwinding mechanism, an adjustment mechanism, a measurement mechanism and a winding mechanism. The unwinding mechanism is configured to unwind a material tape; the adjustment mechanism is arranged downstream of the unwinding mechanism and comprises a first drive roller and a second drive roller; the material tape is wound around the first drive roller and the second drive roller; and the adjustment mechanism is configured to adjust a tensioning force of the material tape by adjusting material tape conveying speeds of the first drive roller and the second drive roller and keep the material tape under a preset tensioning force so that the material tape forms a tensioned area; the measurement mechanism is configured to measure the size of the material tape in the tensioned area; and the winding mechanism is arranged downstream of the adjustment mechanism and configured to wind up the material tape. In another aspect, embodiments of the present application provide a measurement device. The measurement device includes an unwinding mechanism, an adjustment mechanism, a measurement mechanism and a winding mechanism. The unwinding mechanism is configured to unwind a material tape, the unwinding mechanism comprises a feed roller, around which the material tape is wound and a driving mechanism, connected to the feed roller and configured to drive the feed roller to rotate to unwind the material tape. The adjustment mechanism is arranged downstream of the unwinding mechanism and comprises a first drive roller, the material tape is wound on the first drive roller, and the adjustment mechanism is configured to adjust a tensioning force of the material tape by adjusting material tape conveying speeds of the feed roller and the first drive roller and keep the material tape under a preset tensioning force so that the material tape forms a tensioned area between the feed roller and the first drive roller. The measurement mechanism is configured to measure the size of material tape in the tensioned area. The winding mechanism is arranged downstream of the adjustment mechanism and configured to wind up the material tape.

In the above technical solution, the unwinding mechanism and the winding mechanism of the measurement device cooperate to achieve conveying of the material tape. The adjustment mechanism of the measurement device can adjust the tensioning force of the material tape and keep the material tape under a preset tensioning force, so that the material tape maintains a specific and constant amount of deformation to enable the measurement device to measure the size of the material tape more accurately. Measuring results of the measurement device can provide an accurate feedback on the size of the material tape, which is conducive to controlling the production quality of the material tape accordingly, thereby improving the yield of the material tape.

In the above technical solution, both the first drive roller and the second drive roller can drive the material tape to move, and the tensioning force of the material tape can be adjusted by adjusting material tape conveying speeds of the first drive roller and the second drive roller. For example, the first drive roller and the second drive roller have the same roller diameter, the first drive roller can backwards convey the material tape unwound by the unwinding mechanism, and the second drive roller can convey the material tape conveyed by the first drive roller further toward the winding mechanism. If a rotational speed of the second drive roller is greater than a rotational speed of the first drive roller, the second drive roller can convey the material tape to the winding mechanism faster, causing the amount of material tape fed to the second drive roller by the first drive roller to be less than the amount that can be conveyed by the second drive roller, and the part of the material tape located between the first drive roller and the second drive roller is tensioned to form the tensioned area. As a rotational speed difference between the second drive roller and the first drive roller increases, the material tape becomes tighter, and is subjected to a higher tensioning force. Accordingly, the first drive roller and the second drive roller can adjust the tensioning force applied to the material tape and keep the material tape under a preset tensioning force, thus the measurement device measures the size of the material tape more accurately.

As an alternative technical solution of the embodiments of the present application, the measurement device further includes a detection unit configured to detect a tensioning force of the tensioned area, and the first drive roller and the second drive roller respond to detection results of the detection unit.

In the above technical solution, the detection unit is provided to detect the tensioning force of the tensioned area, the first drive roller and the second drive roller may further adjust the tensioning force of the tensioned area according to the detection results of the detection unit, keeping the tensioning force of the tensioned area below the preset tensioning force. In this way, the detection unit, the first drive roller and the second drive roller realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism in detecting the material tape.

As an alternative technical solution of the embodiments of the present application, the measurement device includes a first tension roller, the material tape being sequentially wound around the first drive roller, the first tension roller, and the second drive roller; and the detection unit includes a pressure sensor and a calculation unit, the pressure sensor being configured to measure a pressure applied to the first tension roller by the material tape and being communicatively connected to the calculation unit, and the calculation unit being configured to calculate the tensioning force of the material tape according to detection results of the pressure sensor.

In the above technical solution, the pressure sensor is provided to measure the pressure applied to the first tension roller by the material tape. The pressure applied by the material tape on the first tension roller may be considered as a resultant force of two component forces (tensioning forces) of the material tape on both sides of the tension roller. Accordingly, the calculation unit may calculate the component forces (tensioning forces) on the basis of the pressure applied to the first tension roller by the material tape and an angle between each of two component forces and the pressure. As the detection unit is used for measuring the tensioning force, the measuring results are accurate and the cost is low.

As an alternative technical solution of the embodiments of the present application, the measurement device includes a second tension roller, the material tape being sequentially wound around the first drive roller, the second tension roller, and the second drive roller; and the measurement mechanism and the second tension roller are arranged opposite each other on two sides in a thickness direction of the material tape so that the measurement mechanism measures the size of the part of the material tape wound on the second tension roller.

In the above technical solution, the second tension roller can support the material tape, the measurement mechanism measures the part wound on the second tension roller, so that the material tape is less prone to shaking, making the measuring results more accurate, which is conducive to controlling the production quality of the material tape accordingly, thereby improving the yield of the material tape.

As an alternative technical solution of the embodiments of the present application, the adjustment mechanism further includes a first pinch roller, the first pinch roller and the first drive roller being arranged on two sides in a thickness direction of the material tape, and the first pinch roller and the first drive roller cooperating to convey the material tape; and/or the adjustment mechanism further includes a second pinch roller, the second pinch roller and the second drive roller being arranged on two sides in the thickness direction of the material tape, and the second pinch roller and the second drive roller cooperating to convey the material tape.

In the above technical solution, the first pinch roller is provided to cooperate with the first drive roller to convey the material tape, and the material tape is clamped between the first pinch roller and the first drive roller, so that slipping of the material tape can be avoided. The second pinch roller is provided to cooperate with the second drive roller to convey the material tape, and the material tape is clamped between the second pinch roller and the second drive roller, so that slipping of the material tape can be avoided.

As an alternative technical solution of the embodiments of the present application, the second drive roller is communicatively connected to the measurement mechanism, and the measurement mechanism measures the size of the tensioned area in response to the second drive roller.

In the above technical solution, when the second drive roller starts to move, the measurement mechanism also starts to measure the size of the tensioned area in response to the movement of the second drive roller, so that there is no need to start the measurement mechanism separately, and the degree of automation of the measurement device is increased.

As an alternative technical solution of the embodiments of the present application, the measurement device further includes a detection unit configured to detect a tensioning force of the tensioned area, and the adjustment mechanism responds to detection results of the detection unit.

In the above technical solution, the detection unit is provided to detect the tensioning force of the tensioned area, the adjustment mechanism may further adjust the tensioning force of the tensioned area according to the detection results of the detection unit, keeping the tensioning force of the tensioned area below the preset tensioning force. In this way, the detection unit and the adjustment mechanism realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism in detecting the material tape.

In the above technical solution, the driving mechanism is provided to drive the feed roller to rotate to achieve active unwinding of the material tape.

In the above technical solution, the driving mechanism can drive the feed roller to unwind, the first drive roller can drive the material tape to move, and the tensioning force of the material tape can be adjusted by adjusting an unwinding speed of the feed roller and a material tape conveying speed of the first drive roller. For example, the feed roller and the first drive roller have the same roller diameter, the feed roller can unwind the material tape, and the first drive roller can convey the unwound material tape further toward the winding mechanism. If a rotational speed of the first drive roller is greater than a rotational speed of the feed roller, the first drive roller can convey the material tape to the winding mechanism faster, causing the amount of material tape unwound by the feed roller to be less than the amount that can be conveyed by the first drive roller, and the part of the material tape located between the feed roller and the first drive roller is tensioned to form the tensioned area. As a rotational speed difference between the first drive roller and the feed roller increases, the material tape becomes tighter, and is subjected to a higher tensioning force. Accordingly, the first drive roller can adjust the tensioning force of the material tape and keep the material tape under a preset tensioning force, thus the measurement device measures the size of the material tape more accurately.

As an alternative technical solution of the embodiments of the present application, the measurement device further includes a detection unit configured to detect a tensioning force of the tensioned area, and the first drive roller and the driving mechanism respond to detection results of the detection unit.

In the above technical solution, the detection unit is provided to detect the tensioning force of the tensioned area, the first drive roller and the driving mechanism may further adjust the tensioning force of the tensioned area according to the detection results of the detection unit, keeping the tensioning force of the tensioned area below the preset tensioning force. In this way, the detection unit, the first drive roller and the driving mechanism realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism in detecting the material tape.

As an alternative technical solution of the embodiments of the present application, the measurement device includes a first tension roller, the material tape being sequentially wound around the first tension roller and the first drive roller; and the detection unit includes a pressure sensor and a calculation unit, the pressure sensor being configured to measure a pressure applied to the first tension roller by the material tape and being communicatively connected to the calculation unit, and the calculation unit being configured to calculate the tensioning force of the material tape according to detection results of the pressure sensor.

As an alternative technical solution of the embodiments of the present application, the measurement device includes a second tension roller, the material tape being sequentially wound around the second tension roller and the first drive roller; and the measurement mechanism and the second tension roller are arranged opposite each other on two sides in a thickness direction of the material tape so that the measurement mechanism measures the size of the part of the material tape wound on the second tension roller.

As an alternative technical solution of the embodiments of the present application, the measurement mechanism is an industrial camera.

In the above technical solution, the industrial camera is chosen as the measurement mechanism, which is accurate and reliable, and does not need to touch the material tape when measuring, so it will not damage the material tape.

In a second aspect, embodiments of the present application further provide an electrode plate production system. The electrode plate production system includes a provision device and the measurement device described above. The provision device is configured to provide an electrode plate; and the measurement mechanism is configured to measure the size of the tensioned area.

In order to more clearly describe the technical solutions of the embodiments of the present application, the accompanying drawings required in the embodiments will be described briefly below. It should be understood that the following accompanying drawings illustrate only some embodiments of the present application and therefore should not be construed as a limitation on the scope thereof. For those of ordinary skill in the art, other relevant accompanying drawings can also be obtained from these accompanying drawings without any creative effort.

List of reference numerals: <NUM> - measurement device; <NUM> - unwinding mechanism; <NUM> - feed roller; <NUM> - driving mechanism; <NUM> - adjustment mechanism; <NUM> - first drive roller; <NUM> - second drive roller; <NUM> - first pinch roller; <NUM> - second pinch roller; <NUM> - measurement mechanism; <NUM> - winding mechanism; <NUM> - detection unit; <NUM> - pressure sensor; <NUM> - calculation unit; <NUM> - first tension roller; <NUM> - second tension roller; <NUM> - material tape; <NUM> - tensioned area; <NUM> - electrode plate production system; and <NUM> - provision device;.

In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the embodiments described are some of, rather than all of, the embodiments of the present application. All the other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without any creative effort shall fall within the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; The terms used in the description of the present application are merely for the purpose of describing specific embodiments, but are not intended to limit the present application. The terms "comprising" and "having" and any variations thereof in the description and the claims of the present application as well as the brief description of the accompanying drawings described above are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and the claims of the present application as well as the foregoing accompanying drawings are used to distinguish between different objects, rather than describing a specific order or a primary-secondary relationship.

In the present application, "embodiment" mentioned means that the specific features, structures and characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The phrase at various locations in the description does not necessarily refer to the same embodiment, or an independent or alternative embodiment exclusive of another embodiment.

In the description of the present application, it should be noted that, the terms "mount", "connected", "connect", or "attach" should be interpreted in a broad sense unless explicitly defined and limited otherwise. For example, they may be a fixed connection, a detachable connection, or an integral connection; or may be a direct connection, an indirect connection by means of an intermediate medium, or internal communication between two elements. For those of ordinary skills in the art, the specific meaning of the foregoing terms in the present application may be understood according to specific circumstances.

The term "and/or" in the present application is merely a description of the associated relationship of associated objects, representing that three relationships may exist, for example, A and/or B, may be expressed as: the three instances of A alone, A and B simultaneously, and B alone. In addition, the character "/" in the present application generally indicates that the associated objects before and after the character are in a relationship of "or".

In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the dimensions, such as thickness, length and width, of the various components in the embodiments of the present application illustrated in the accompanying drawings, as well as the dimensions, such as an overall thickness, length and width, of an integrated apparatus are merely illustrative and should not be construed to limit the present application in any way.

"A plurality of' appearing in the present application means two or more (including two).

In the present application, a battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, cuboid or in another shape, which will also not be limited in the embodiments of the present application. The battery cells are generally classified into three types depending on the way of package: cylindrical battery cells, prismatic battery cells and pouch battery cells, which also will not be limited in the embodiments of the present application.

A battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a high voltage and capacity. For example, the battery mentioned in the present application may include a battery module, a battery pack, etc. The battery generally includes a case for packaging one or more battery cells. The case can prevent liquid or other foreign matters from affecting charging or discharging of a battery cell.

The battery cell includes an electrode assembly and an electrolytic solution. The electrode assembly is composed of a positive electrode plate, a negative electrode plate and a separator. The operation of the battery cell mainly relies on the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. A surface of the positive electrode current collector is coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxides, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. A surface of the negative electrode current collector is coated with the negative electrode active material layer, the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector that is not coated with the negative electrode active material layer is used as a negative electrode tab. The negative current collector may be made of copper, and the negative electrode active material may be carbon, silicon, etc. In order to ensure that no fusing occurs when a large current passes, a plurality of positive tabs are provided and are stacked together, and a plurality of negative tabs are provided and are stacked together. The separator may be made of PP (polypropylene), PE (polyethylene), etc. In addition, the electrode assembly may be of a wound structure or a laminated structure, which will not be limited in the embodiments of the present application.

At present, from the perspective of the development of the market situation, batteries are used more and more widely. The batteries are not only used in energy storage power systems such as hydroelectric power plants, thermal power plants, wind power plants and solar power plants, but also widely used in electric transportation means such as electric bicycles, electric motorcycles and electric vehicles and in many fields such as military equipment and aerospace. With the continuous expansion of the application field of batteries, the market demand for the batteries is also expanding.

A battery cell includes an electrode assembly, and the electrode assembly is a component, where an electrochemical reaction occurs, in the battery cell. The electrode assembly is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate. However, the yield in production of electrode plates at present is low.

The inventors further researched and found that in the electrode plate production process, it is necessary to measure outline dimensions of electrode plates periodically and regulate production equipment according to measuring results in order to control the quality of the electrode plates. A manual measurement method is stilled used for measurement at present, and the specific operation is as follows: laying an electrode plate across a stainless steel measuring platform, straightening the electrode plate, fixing both ends of the electrode plate with an adhesive tape, and then using a steel measuring scale with an accuracy of <NUM> to measure the total length of the electrode plate, and a plastic measuring scale with an accuracy of <NUM> to measure a width of the electrode plate, a width of a film area, a height of a tab, a width of the tab, a distance between tabs and other outline dimensions. However, the tensioning force of the electrode plate cannot be quantified when the electrode plate is manually tensioned, the measured values of the total length of the electrode plate under different tensioning conditions are different, and this deviation value may affect the final measuring result, leading to a failure in accurate measurement of the size of the electrode plate. The production quality of electrode plates is controlled according to the measuring result of this method, resulting in a low yield of the electrode plates, which may seriously lead to rejects in batches.

In view of this, embodiments of the present application provide a measurement device, in which the adjustment mechanism is provided to adjust a tensioning force of a material tape and keep the material tape under a preset tensioning force, so that the material tape maintains a specific and constant amount of deformation, and thus the measurement device measures the size of the material tape more accurately. Measuring results of the measurement device can provide an accurate feedback on the size of the material tape, which is conducive to controlling the production quality of the material tape accordingly, thereby improving the yield of the material tape.

The technical solutions described in the embodiments of the present application are applicable to dimensional measurement of strip-like structures, such as electrode plates, belts, and ribbons.

Referring to <FIG> is a block diagram of a measurement device <NUM> according to some embodiments of the present application. <FIG> is a schematic diagram of a measurement device <NUM> according to some embodiments of the present application. In some embodiments, the embodiments of the present application provide a measurement device <NUM>. The measurement device <NUM> includes an unwinding mechanism <NUM>, an adjustment mechanism <NUM>, a measurement mechanism <NUM> and a winding mechanism <NUM>. The unwinding mechanism <NUM> is configured to unwind a material tape <NUM>. The adjustment mechanism <NUM> is arranged downstream of the unwinding mechanism <NUM>. The adjustment mechanism <NUM> is configured to adjust a tensioning force of the material tape <NUM> so that the material tape <NUM> forms a tensioned area <NUM>. The measurement mechanism <NUM> is configured to measure the size of the tensioned area <NUM>. The winding mechanism <NUM> is arranged downstream of the adjustment mechanism <NUM>. The winding mechanism <NUM> is configured to wind up the material tape <NUM>.

The unwinding mechanism <NUM> is a mechanism for releasing the wound material tape <NUM>. The unwinding mechanism <NUM> may achieve active unwinding or passive unwinding. The passive unwinding may be achieved with the aid of the adjustment mechanism <NUM>.

Corresponding to the unwinding mechanism <NUM>, the winding mechanism <NUM> is a mechanism configured to wind up the material tape <NUM>. The winding mechanism <NUM> includes a winding roller and a driving unit, the driving unit being connected to the winding roller and configured to drive the winding roller to rotate so as to wind up the material tape <NUM> on the winding roller.

The adjustment mechanism <NUM> is a mechanism configured to adjust the tensioning force of the material tape <NUM>. When the measurement mechanism <NUM> measures, the tensioning force of the material tape <NUM> is adjusted to a preset tensioning force by the adjustment mechanism <NUM>, so that the material tape <NUM> maintains a specific and constant amount of deformation, improving the accuracy of the measurement mechanism <NUM>.

The tensioned area <NUM> is the part of the material tape <NUM> where the tensioning force is adjusted by the adjustment mechanism <NUM>, and the tensioning force of the tensioned area <NUM> is below the preset tensioning force. Since the tensioning force of the part of the material tape <NUM> that is adjusted by the adjustment mechanism <NUM> may be different from the tensioning force of other parts, the tensioned area <NUM> is used to refer specifically to the part of the material tape where the tensioning force is adjusted by the adjustment mechanism <NUM>.

The measurement mechanism <NUM> is a mechanism having a measuring function. The measurement mechanism <NUM> is capable of measuring the size of the tensioned area <NUM>. For example, if the material tape <NUM> refers to an electrode plate, the measurement mechanism <NUM> can measure the overall length of the electrode plate, a width of the electrode plate, a width of a film area, a height of a tab, a width of the tab, a distance between tabs, and other outline dimensions.

"The adjustment mechanism <NUM> is arranged downstream of the unwinding mechanism <NUM> and the winding mechanism <NUM> is arranged downstream of the adjustment mechanism <NUM>" means that the material tape <NUM> is unwound by the unwinding mechanism <NUM>, and is wound up by the winding mechanism <NUM> after passing through the adjustment mechanism <NUM>. It corresponds to the arrangement positions of the adjustment mechanism <NUM> and the winding mechanism <NUM>.

The unwinding mechanism <NUM> and the winding mechanism <NUM> of the measurement device <NUM> cooperate to achieve conveying of the material tape <NUM>. The adjustment mechanism <NUM> of the measurement device <NUM> can adjust the tensioning force of the material tape <NUM> and keep the material tape <NUM> under a preset tensioning force, so that the material tape <NUM> maintains a specific and constant amount of deformation, and thus the measurement mechanism <NUM> measures the size of the material tape <NUM> more accurately. Measuring results of the measurement device <NUM> can provide an accurate feedback on the size of the material tape <NUM>, which is conducive to controlling the production quality of the material tape <NUM> accordingly, thereby improving the yield of the material tape <NUM>.

Referring to <FIG>, in some embodiments, the adjustment mechanism <NUM> includes a first drive roller <NUM> and a second drive roller <NUM>. The material tape <NUM> is wound around the first drive roller <NUM> and the second drive roller <NUM>, and the part of the material tape <NUM> located between the first drive roller <NUM> and the second drive roller <NUM> forms the tensioned area <NUM>.

The first drive roller <NUM> and the second drive roller <NUM> are drive rollers capable of rotating actively, and the first drive roller <NUM> and the second drive roller <NUM> can drive the material tape <NUM> to move when rotating (arrows in the figure identify the direction of rotation of the structure capable of rotating actively). Referring to <FIG>, the first drive roller <NUM> is located downstream of the unwinding mechanism <NUM> and the second drive roller <NUM> is located downstream of the first drive roller <NUM>. The material tape <NUM> unwound by the unwinding mechanism <NUM> is sequentially wound around the first drive roller <NUM> and the second drive roller <NUM>, and wound up by the winding mechanism <NUM>.

Taking the first drive roller <NUM> as an example, the first drive roller <NUM> includes a roller body and a driving member, the roller body is connected to the driving member, the driving member is configured to drive the roller body to rotate, and the material tape <NUM> is wound on the roller body. When the driving member moves, the roller body rotates to drive the material tape <NUM> to move. The driving member may be a motor, an internal combustion engine, etc. The second drive roller <NUM> has a structure the same as that of the first drive roller <NUM>, which will not be repeated here.

Both the first drive roller <NUM> and the second drive roller <NUM> can drive the material tape <NUM> to move, and the tensioning force of the material tape <NUM> can be adjusted by adjusting material tape <NUM> conveying speeds of the first drive roller <NUM> and the second drive roller <NUM>. For example, the first drive roller <NUM> and the second drive roller <NUM> have the same roller diameter, the first drive roller <NUM> can backwards convey the material tape <NUM> unwound by the unwinding mechanism <NUM>, and the second drive roller <NUM> can convey the material tape <NUM> conveyed by the first drive roller <NUM> further toward the winding mechanism <NUM>. If a rotational speed of the second drive roller <NUM> is greater than a rotational speed of the first drive roller <NUM>, the second drive roller <NUM> can convey the material tape <NUM> to the winding mechanism <NUM> faster, causing the amount of material tape <NUM> fed to the second drive roller <NUM> by the first drive roller <NUM> to be less than the amount that can be conveyed by the second drive roller <NUM>, and the part of the material tape <NUM> located between the first drive roller <NUM> and the second drive roller <NUM> is tensioned to form the tensioned area <NUM>. As a rotational speed difference between the second drive roller <NUM> and the first drive roller <NUM> increases, the material tape <NUM> becomes tighter, and the material tape <NUM> is subjected to a higher tensioning force. Accordingly, the first drive roller <NUM> and the second drive roller <NUM> can adjust the tensioning force applied to the material tape <NUM> and keep the material tape <NUM> under a preset tensioning force, thus the measurement mechanism <NUM> measures the size of the material tape <NUM> more accurately.

Referring to <FIG> is a block diagram of a measurement device <NUM> (including a detection unit <NUM>) according to some embodiments of the present application. In some embodiments, the measurement device <NUM> further includes the detection unit <NUM>. The detection unit <NUM> is configured to detect a tensioning force in the tensioned area <NUM>. The first drive roller <NUM> and the second drive roller <NUM> respond to detection results of the detection unit <NUM>.

The detection unit <NUM> is a component for detecting the tensioning force of the tensioned area <NUM>. The detection unit <NUM> may be communicatively connected to the first drive roller <NUM> and the second drive roller <NUM>, including the detection unit <NUM> being connected to the first drive roller <NUM> and the second drive roller <NUM> by means of a wired connection such as a wire and a network cable, and also including the detection unit <NUM> being connected to the first drive roller <NUM> and the second drive roller <NUM> by means of a wireless connection such as Bluetooth and a wireless network. The communication connection may refer to that the detection unit <NUM> is directly connected to the first drive roller <NUM> and the second drive roller <NUM> or that the detection unit <NUM> is indirectly connected to the first drive roller <NUM> and the second drive roller <NUM> through some intermediate component. For example, the intermediate component may be a controller. The detection unit <NUM> is electrically connected to the controller, the controller is electrically connected to the first drive roller <NUM> and the second drive roller <NUM>, the controller receives the detection results from the detection unit <NUM> and controls the first drive roller <NUM> and the second drive roller <NUM> to adjust the tensioning force of the tensioned area <NUM> according to the detection results.

"The first drive roller <NUM> and the second drive roller <NUM> respond to detection results of the detection unit <NUM>" means that the first drive roller <NUM> and the second drive roller <NUM> adjust the tensioning force of the tensioned area <NUM> according to the detection results of the detection unit <NUM>. The first drive roller <NUM> and the second drive roller <NUM> may be controlled by the controller to regulate the tensioning force as described above, or may be controlled directly by the detection unit <NUM> to regulate the tensioning force.

The detection unit <NUM> is provided to detect the tensioning force of the tensioned area <NUM>, the first drive roller <NUM> and the second drive roller <NUM> may further adjust the tensioning force of the tensioned area <NUM> according to the detection results of the detection unit <NUM>, keeping the tensioning force of the tensioned area <NUM> below the preset tensioning force. In this way, the detection unit <NUM>, the first drive roller <NUM> and the second drive roller <NUM> realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism <NUM> in detecting the material tape <NUM>.

Referring to <FIG>, <FIG> and <FIG>, <FIG> is a schematic diagram of a measurement device <NUM> (including a detection unit <NUM>) according to some embodiments of the present application. <FIG> is a block diagram of a detection unit <NUM> according to some embodiments of the present application. <FIG> is a force analysis diagram of a first tension roller <NUM> according to some embodiments of the present application. In some embodiments, the measurement device <NUM> includes a first tension roller <NUM>, the material tape <NUM> being sequentially wound around the first drive roller <NUM>, the first tension roller <NUM> and the second drive roller <NUM>. The detection unit <NUM> includes a pressure sensor <NUM> and a calculation unit <NUM>. The pressure sensor <NUM> is configured to measure a pressure applied to the first tension roller <NUM> by the material tape <NUM>. The pressure sensor <NUM> is communicatively connected to the calculation unit <NUM>. The calculation unit <NUM> is configured to calculate the tensioning force of the material tape <NUM> according to detection results of the pressure sensor <NUM>.

The first tension roller <NUM> is a roller structure for tensioning the material tape <NUM>. The first tension roller <NUM> is located between the first drive roller <NUM> and the second drive roller <NUM> along a conveying direction of the material tape <NUM>, so that the material tape <NUM> can be sequentially wound around the first drive roller <NUM>, the first tension roller <NUM> and the second drive roller <NUM>.

The pressure sensor <NUM> is a device or apparatus that can sense a pressure signal and can convert the pressure signal into a usable electrical signal according to a certain law. The pressure sensor <NUM> can measure the applied pressure. For example, as shown in <FIG>, the pressure sensor <NUM> is arranged on a seat of the first tension roller <NUM>, and the seat of the first tension roller <NUM> can support the first tension roller <NUM> to withstand gravity of the first tension roller <NUM> (indicated as G shown in <FIG>). The material tape <NUM> is wound on the first tension roller <NUM> and applies an upward pressure (indicated as F<NUM> shown in <FIG>) on the first tension roller <NUM> to cancel part of the gravitational force. The pressure sensor <NUM> may detect the force on the seat (which is assumed to be N) and calculate the pressure (F<NUM>=G-N) applied on the first tension roller <NUM> by the material tape <NUM> based on the gravity of the first tension roller <NUM>. Based on the pressure applied on the first tension roller <NUM> by the material tape <NUM>, the tensioning force of the tensioned area <NUM> may be calculated (the tensioning force of the tensioned area <NUM> is indicated as F<NUM> shown in <FIG>, where F<NUM>=F<NUM>/2cosa). For another example, the pressure sensor <NUM> may be arranged on the roller surface of the first tension roller <NUM>, so that the pressure sensor <NUM> can directly measure the pressure applied to the first tension roller <NUM> by the material tape <NUM>.

The calculation unit <NUM> is a component with information processing and program operation. For example, the computing unit <NUM> may be a CPU (Central Processing Unit), a PLC (Programmable Logic Controller), an ECU (Electronic Control Unit), etc. The calculation unit <NUM> may be communicatively connected to the first drive roller <NUM> and the second drive roller <NUM>. The calculation unit <NUM> may also be communicatively connected to the controller, which is then communicatively connected to the first drive roller <NUM> and the second drive roller <NUM> through the controller.

The pressure sensor <NUM> is provided to measure the pressure applied to the first tension roller <NUM> by the material tape <NUM>. The pressure applied on the first tension roller <NUM> by the material tape <NUM> may be considered as a resultant force of two component forces (tensioning forces) of the material tape <NUM> on both sides of the tension roller. Accordingly, the calculation unit <NUM> may calculate the component forces (tensioning forces) on the basis of the pressure applied to the first tension roller <NUM> by the material tape <NUM> and an angle between each of two component forces and the pressure. As the detection unit <NUM> is used for measuring the tensioning force, the measuring results are accurate and the cost is low.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> (including a second tension roller <NUM>) according to some embodiments of the present application. In some embodiments, the measurement device <NUM> includes the second tension roller <NUM>, the material tape <NUM> being sequentially wound around the first drive roller <NUM>, the second tension roller <NUM> and the second drive roller <NUM>. The measurement mechanism <NUM> and the second tension roller <NUM> are arranged opposite each other on two sides in a thickness direction of the material tape <NUM> so that the measurement mechanism <NUM> measures the size of the part of the material tape <NUM> wound on the second tension roller <NUM>.

The second tension roller <NUM> is a roller structure for tensioning the material tape <NUM>. Along a conveying direction of the material tape <NUM>, the second tension roller <NUM> is located between the first drive roller <NUM> and the second drive roller <NUM>, so that the material tape <NUM> can be sequentially wound around the first drive roller <NUM>, the second tension roller <NUM> and the second drive roller <NUM>.

Both the first tension roller <NUM> and the second tension roller <NUM> are located between the first drive roller <NUM> and the second drive roller <NUM> along the conveying direction of the material tape <NUM>. The order of the first tension roller <NUM> and the second tension roller <NUM> is not limited. The first tension roller <NUM> may be located between the first drive roller <NUM> and the second tension roller <NUM>, or between the second drive roller <NUM> and the second tension roller <NUM>. As shown in <FIG>, the first tension roller <NUM> is located downstream of the first drive roller <NUM> and upstream of the second tension roller <NUM>. The material tape <NUM> is sequentially wound around the first drive roller <NUM>, the first tension roller <NUM>, the second tension roller <NUM> and the second drive roller <NUM>.

The second tension roller <NUM> can support the material tape <NUM>, the measurement mechanism <NUM> measures the part wound on the second tension roller <NUM>, so that the material tape <NUM> is less prone to shaking, making the measuring results more accurate, which is conducive to controlling the production quality of the material tape <NUM> accordingly, thereby improving the yield of the material tape <NUM>.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> (including a first pinch roller <NUM> and a second pinch roller <NUM>) according to some embodiments of the present application. In some embodiments, the adjustment mechanism <NUM> further includes the first pinch roller <NUM>, and the first pinch roller <NUM> and the first drive roller <NUM> are arranged on both sides of the material tape <NUM> along a thickness direction of the material tape <NUM>. The first pinch roller <NUM> and the first drive roller <NUM> cooperate to convey the material tape <NUM>. Additionally or alternatively, the adjustment mechanism <NUM> further includes the second pinch roller <NUM>, the second pinch roller <NUM> and the second drive roller <NUM> being arranged on both sides of the material tape <NUM>, in the thickness direction of the material tape <NUM>. The second pinch roller <NUM> and the second drive roller <NUM> cooperate to convey the material tape <NUM>.

The first pinch roller <NUM> is a roller structure that cooperates with the first drive roller <NUM> to clamp the material tape <NUM>. The first pinch roller <NUM> can convey the material tape <NUM> in conjunction with the first drive roller <NUM>.

The second pinch roller <NUM> is a roller structure that cooperates with the second drive roller <NUM> to clamp the material tape <NUM>. The second pinch roller <NUM> may convey the material tape <NUM> in conjunction with the second drive roller <NUM>.

The first pinch roller <NUM> is provided to cooperate with the first drive roller <NUM> to convey the material tape <NUM>, and the material tape <NUM> is clamped between the first pinch roller <NUM> and the first drive roller <NUM>, so that slipping of the material tape <NUM> can be avoided. The second pinch roller <NUM> is provided to cooperate with the second drive roller <NUM> to convey the material tape <NUM>, and the material tape <NUM> is clamped between the second pinch roller <NUM> and the second drive roller <NUM>, so that slipping of the material tape <NUM> can be avoided.

In some embodiments, the second drive roller <NUM> and the measurement mechanism <NUM> are connected in communication, and the measurement mechanism <NUM> measures the dimensions of the tensioned area <NUM> in response to the second drive roller <NUM>.

"The measurement mechanism <NUM> measures the size of the tensioned area <NUM> in response to the second drive roller <NUM>" means that the measurement mechanism <NUM> starts measuring the size of the tensioned area <NUM> when the second drive roller <NUM> moves. For example, the driving member of the second drive roller <NUM> has a built-in encoder, the encoder being communicatively connected to the measurement mechanism <NUM>. When the encoder starts to act, the measurement mechanism <NUM> also starts to measure the size of the tensioned area <NUM>.

When the second drive roller <NUM> starts to move, the measurement mechanism <NUM> also starts to measure the size of the tensioned area <NUM> in response to the movement of the second drive roller <NUM>, so that there is no need to start the measurement mechanism <NUM> separately, and the degree of automation of the measurement device <NUM> is increased.

In some embodiments, the measurement device <NUM> further includes a detection unit <NUM>. The detection unit <NUM> is configured to detect the tensioning force of the tensioned area <NUM>, and the adjustment mechanism <NUM> responds to detection results of the detection unit <NUM>.

"The adjustment mechanism <NUM> responds to detection results of the detection unit <NUM>" means that the adjustment mechanism <NUM> adjusts the tensioning force of the tensioned area <NUM> according to the detection results of the detection unit <NUM>. The adjustment mechanism <NUM> may be controlled by the controller to adjust the tensioning force in response to the detection results of the detection unit <NUM>, or may be controlled directly by the detection unit <NUM> to adjust the tensioning force.

The detection unit <NUM> is provided to detect the tensioning force of the tensioned area <NUM>, the adjustment mechanism <NUM> may further adjust the tensioning force of the tensioned area <NUM> according to the detection results of the detection unit <NUM>, keeping the tensioning force of the tensioned area <NUM> below the preset tensioning force. In this way, the detection unit <NUM> and the adjustment mechanism <NUM> realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism <NUM> in detecting the material tape <NUM>.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> (active winding) according to some embodiments of the present application. <FIG> is a block diagram of an unwinding mechanism <NUM> according to some embodiments of the present application. In some embodiments, the unwinding mechanism <NUM> includes a feed roller <NUM> and a driving mechanism <NUM>, the material tape <NUM> being wound around the feed roller <NUM>. The driving mechanism <NUM> is connected to the feed roller <NUM> and the driving mechanism <NUM> is configured to drive the feed roller <NUM> to rotate to unwind the material tape <NUM>.

The feed roller <NUM> is a roller structure around which the material tape <NUM> is wound. The driving mechanism <NUM> is a power mechanism for driving the feed roller <NUM> to rotate. The driving mechanism <NUM> may be an electric motor, an internal combustion engine, etc. For example, the driving mechanism <NUM> is an electric motor, and an output end of the electric motor is connected to the feed roller <NUM> to drive the feed roller <NUM> to rotate. The driving mechanism <NUM> may also include a linear driving member and a transmission mechanism, the linear driving member outputting linear motion and the transmission mechanism converting the linear motion into rotational motion to drive the feed roller <NUM> to rotate. The linear driving member includes, but is not limited to, an air cylinder, an electric cylinder and a hydraulic cylinder. The transmission mechanism may be a crank slider mechanism, a cam mechanism, etc..

The driving mechanism <NUM> is provided to drive the feed roller <NUM> to rotate to achieve active unwinding of the material tape <NUM>.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> according to some other embodiments of the present application. In some other embodiments, the adjustment mechanism <NUM> includes a first drive roller <NUM>, the material tape <NUM> being wound on the first drive roller <NUM>. The part of the material tape <NUM> located between the first drive roller <NUM> and the feed roller <NUM> forms the tensioned area <NUM>.

The driving mechanism <NUM> can drive the feed roller <NUM> to unwind, the first drive roller <NUM> can drive the material tape <NUM> to move, and the tensioning force of the material tape <NUM> can be adjusted by adjusting an unwinding speed of the feed roller <NUM> and a material tape <NUM> conveying speed of the first drive roller <NUM>. For example, the feed roller <NUM> and the first drive roller <NUM> have the same roller diameter, the feed roller <NUM> can unwind the material tape <NUM>, and the first drive roller <NUM> can convey the unwound material tape <NUM> further toward the winding mechanism <NUM>. If a rotational speed of the first drive roller <NUM> is greater than a rotational speed of the feed roller <NUM>, the first drive roller <NUM> can convey the material tape <NUM> to the winding mechanism <NUM> faster, causing the amount of material tape <NUM> unwound by the feed roller <NUM> to be less than the amount that can be conveyed by the first drive roller <NUM>, and the part of the material tape <NUM> located between the feed roller <NUM> and the first drive roller <NUM> is tensioned to form the tensioned area <NUM>. As a rotational speed difference between the first drive roller <NUM> and the feed roller <NUM> increases, the material tape <NUM> becomes tighter, and the material tape <NUM> is subjected to a higher tensioning force. Accordingly, the first drive roller <NUM> can adjust the tensioning force of the material tape <NUM> and keep the material tape <NUM> under a preset tensioning force, thus the measurement mechanism <NUM> measures the size of the material tape <NUM> more accurately.

In some embodiments, the measurement device <NUM> further includes the detection unit <NUM>. The detection unit <NUM> is configured to detect a tensioning force in the tensioned area <NUM>. The first drive roller <NUM> and the driving mechanism <NUM> respond to detection results of the detection unit <NUM>.

The detection unit <NUM> is a component for detecting the tensioning force of the tensioned area <NUM>. The detection unit <NUM> may be communicatively connected to the first drive roller <NUM> and the driving mechanism <NUM>, including the detection unit <NUM> being connected to the first drive roller <NUM> and the driving mechanism <NUM> by means of a wired connection such as a wire, and a network cable, and also including the detection unit <NUM> being connected to the first drive roller <NUM> and the driving mechanism <NUM> by means of a wireless connection such as Bluetooth, and a wireless network. The communication connection may refer to that the detection unit <NUM> is directly connected to the first drive roller <NUM> and the driving mechanism <NUM>, or may be that the detection unit <NUM> is indirectly connected to the first drive roller <NUM> and the driving mechanism <NUM> through some intermediate component. For example, the intermediate component may be a controller, the detection unit <NUM> is electrically connected to the controller, the controller is electrically connected to the first drive roller <NUM> and the driving mechanism <NUM>, and the controller receives the detection results from the detection unit <NUM> and controls the first drive roller <NUM> and the driving mechanism <NUM> to adjust the tensioning force of the tensioned area <NUM> based on the detection results.

The detection unit <NUM> is provided to detect the tensioning force of the tensioned area <NUM>, the first drive roller <NUM> and the driving mechanism <NUM> may further adjust the tensioning force of the tensioned area <NUM> according to the detection results of the detection unit <NUM>, keeping the tensioning force of the tensioned area <NUM> below the preset tensioning force. In this way, the detection unit <NUM>, the first drive roller <NUM> and the driving mechanism <NUM> realize feedback adjustment, which helps to improve the accuracy of the measurement mechanism <NUM> in detecting the material tape <NUM>.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> (including a detection unit <NUM>) according to some other embodiments of the present application. In some other embodiments, the measurement unit <NUM> includes a first tension roller <NUM>, the material tape <NUM> being sequentially wound around the first tension roller <NUM> and the first drive roller <NUM>. The detection unit <NUM> includes a pressure sensor <NUM> and a calculation unit <NUM>, the pressure sensor <NUM> being configured to measure a pressure applied to the first tension roller <NUM> by the material tape <NUM>. The pressure sensor <NUM> is communicatively connected to the calculation unit <NUM>. The calculation unit <NUM> is configured to calculate the tensioning force of the material tape <NUM> according to detection results of the pressure sensor <NUM>.

The first tension roller <NUM> is a roller structure for tensioning the material tape <NUM>. Along a conveying direction of the material tape <NUM>, the first tension roller <NUM> is located between the feed roller <NUM> and the first drive roller <NUM>, so that the material tape <NUM> can be sequentially wound around the first tension roller <NUM> and the first drive roller <NUM>.

Referring to <FIG> is a schematic diagram of a measurement device <NUM> (including a second tension roller <NUM>) according to some other embodiments of the present application. In some other embodiments, the measurement device <NUM> includes the second tension roller <NUM>, the material tape <NUM> being sequentially wound around the second tension roller <NUM> and the first drive roller <NUM>. The measurement mechanism <NUM> and the second tension roller <NUM> are arranged opposite each other on two sides in a thickness direction of the material tape <NUM> so that the measurement mechanism <NUM> measures the size of the part of the material tape <NUM> wound on the second tension roller <NUM>.

The second tension roller <NUM> is a roller structure for tensioning the material tape <NUM>. Along a conveying direction of the material tape <NUM>, the second tension roller <NUM> is located between the feed roller <NUM> and the first drive roller <NUM>, so that the material tape <NUM> can be sequentially wound around the second tension roller <NUM> and the first drive roller <NUM>.

Both the first tension roller <NUM> and the second tension roller <NUM> are located between the feed roller <NUM> and the first drive roller <NUM> along the conveying direction of the material tape <NUM>. The order of the first tension roller <NUM> and the second tension roller <NUM> is not limited. The first tension roller <NUM> may be located between the feed roller <NUM> and the second tension roller <NUM>, or between the first drive roller <NUM> and the second tension roller <NUM>. As shown in <FIG>, the second tension roller <NUM> is located downstream of the first tension roller <NUM> and upstream of the first drive roller <NUM>. The material tape <NUM> is sequentially wound around the first tension roller <NUM>, the second tension roller <NUM> and the first drive roller <NUM>.

The second tension roller <NUM> can support the material tape <NUM>, the measurement mechanism <NUM> detects the part wound on the second tension roller <NUM>, so that the material tape <NUM> is less prone to shaking, making the measuring results more accurate, which is conducive to controlling the production quality of the material tape <NUM> accordingly, thereby improving the yield of the material tape <NUM>.

In some embodiments, the measurement mechanism <NUM> is an industrial camera.

The industrial camera is capable of acquiring images of the tensioned area <NUM> and processing the images to obtain the size of the material tape <NUM>.

The industrial camera is chosen as the measurement mechanism <NUM>, which is accurate and reliable, and does not need to touch the material tape <NUM> when measuring, so it will not damage the material tape <NUM>.

In some other embodiments, the measurement mechanism <NUM> may also be a scanner.

Referring to <FIG> is a block diagram of an electrode plate production system <NUM> according to some embodiments of the present application. Embodiments of the present application further provide an electrode plate production system <NUM>. The electrode plate production system <NUM> includes a provision device <NUM> and the measurement device <NUM> described above. The provision device <NUM> is configured to provide an electrode plate; and the measurement device <NUM> is configured to measure the size of the tensioned area <NUM>.

According to some embodiments of the present application, reference is made to <FIG>.

Embodiments of the present application provide a measurement device <NUM>. The measurement device <NUM> includes an unwinding mechanism <NUM>, an adjustment mechanism <NUM>, a measurement mechanism <NUM> and a winding mechanism <NUM>. The unwinding mechanism <NUM> is configured to unwind a material tape <NUM>. The adjustment mechanism <NUM> is arranged downstream of the unwinding mechanism <NUM>. The adjustment mechanism <NUM> includes a first drive roller <NUM> and a second drive roller <NUM>, the material tape <NUM> being wound around the first drive roller <NUM> and the second drive roller <NUM>. The first drive roller <NUM> and the second drive roller <NUM> are configured to cooperate to adjust a tensioning force of the material tape <NUM> so that the part of the material tape <NUM> located between the first drive roller <NUM> and the second drive roller <NUM> forms a tensioned area <NUM>. The measurement mechanism <NUM> is configured to measure the size of the tensioned area <NUM>. The winding mechanism <NUM> is arranged downstream of the adjustment mechanism <NUM>. The winding mechanism <NUM> is configured to wind up the material tape <NUM>.

The measurement device <NUM> further includes a detection unit <NUM>. The detection unit <NUM> is configured to detect a tensioning force of the tensioned area <NUM>, and the first drive roller <NUM> and the second drive roller <NUM> respond to detection results of the detection unit <NUM>.

The unwinding mechanism <NUM> and the winding mechanism <NUM> of the measurement device <NUM> cooperate to achieve conveying of the material tape <NUM>. The adjustment mechanism <NUM> of the measurement device <NUM> can adjust the tensioning force of the material tape <NUM> and keep the material tape <NUM> under a preset tensioning force, so that the material tape <NUM> maintains a specific and constant amount of deformation, and thus the measurement mechanism <NUM> measures the size of the material tape <NUM> more accurately. Measuring results of the measurement device <NUM> can provide an accurate feedback on the size of the material tape <NUM>, which is conducive to controlling the production quality of the material tape <NUM> accordingly, thereby improving the yield of the material tape <NUM>. Both the first drive roller <NUM> and the second drive roller <NUM> can drive the material tape <NUM> to move, and the tensioning force of the material tape <NUM> can be adjusted by adjusting material tape <NUM> conveying speeds of the first drive roller <NUM> and the second drive roller <NUM>. For example, the first drive roller <NUM> and the second drive roller <NUM> have the same roller diameter, the first drive roller <NUM> can backwards convey the material tape <NUM> unwound by the unwinding mechanism <NUM>, and the second drive roller <NUM> can convey the material tape <NUM> conveyed by the first drive roller <NUM> further toward the winding mechanism <NUM>. If a rotational speed of the second drive roller <NUM> is greater than a rotational speed of the first drive roller <NUM>, the second drive roller <NUM> can convey the material tape <NUM> to the winding mechanism <NUM> faster, causing the amount of material tape <NUM> fed to the second drive roller <NUM> by the first drive roller <NUM> to be less than the amount that can be conveyed by the second drive roller <NUM>, and the part of the material tape <NUM> located between the first drive roller <NUM> and the second drive roller <NUM> is tensioned to form the tensioned area <NUM>. As a rotational speed difference between the second drive roller <NUM> and the first drive roller <NUM> increases, the material tape <NUM> becomes tighter, and the material tape <NUM> is subjected to a higher tensioning force. Accordingly, the first drive roller <NUM> and the second drive roller <NUM> can adjust the tensioning force applied to the material tape <NUM> and keep the material tape <NUM> under a preset tensioning force, thus the measurement mechanism <NUM> measures the size of the material tape <NUM> more accurately.

Claim 1:
A measurement device (<NUM>) comprising:
an unwinding mechanism (<NUM>), configured to unwind a material tape (<NUM>);
an adjustment mechanism (<NUM>), arranged downstream of the unwinding mechanism (<NUM>) and comprising a first drive roller (<NUM>) and a second drive roller (<NUM>), the material tape (<NUM>) being wound around the first drive roller (<NUM>) and the second drive roller (<NUM>), the adjustment mechanism (<NUM>) being configured to adjust a tensioning force of the material tape (<NUM>) by adjusting material tape conveying speeds of the first drive roller (<NUM>) and the second drive roller (<NUM>) and keep the material tape (<NUM>) under a preset tensioning force so that the material tape (<NUM>) forms a tensioned area (<NUM>) between the first drive roller (<NUM>) and the second drive roller (<NUM>);
a measurement mechanism (<NUM>), configured to measure the size of the material tape (<NUM>) in the tensioned area (<NUM>); and
a winding mechanism (<NUM>), arranged downstream of the adjustment mechanism (<NUM>) and configured to wind up the material tape (<NUM>).