Battery cell thickness measuring method and device, electronic equipment and computer readable storage medium

Abstract

The invention provides a battery cell thickness measuring method and device, electronic equipment and a computer readable storage medium. The method comprises the following steps: acquiring a first pressure applied to a to-be-measured battery cell by a downward pressing mechanism driven by a lifting mechanism; when it is judged that the first pressure reaches the first preset pressure, the downward pressing mechanism is controlled to stop moving, and first control voltage of the lifting mechanism is obtained; and determining the thickness of the to-be-measured cell according to the first control voltage and a preset function about the thickness and the voltage. According to the invention, the cell thickness measurement efficiency can be improved, and adverse effects of environmental factors and human factors on the measurement of the cell thickness are avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a method, device, electronic device and computer-readable storage medium for measuring thickness of a battery cell in the field of battery technology. Background Art

[0002] During the production process of battery cells, it is necessary to ensure that the thickness of the battery cells does not exceed the set specifications. If the thickness of the battery cells exceeds the set specifications, it will not only bring difficulties to the assembly process, but also cause safety hazards to the battery during use. Therefore, in the process of producing battery cells, it is very important to test the thickness of the battery cells.

[0003] The current method for measuring the thickness of battery cells is contact measurement. During the measurement process, the temperature will affect the stability of the measurement, resulting in poor thickness measurement accuracy. Summary of the invention

[0004] The present application provides a method, device, electronic device and computer-readable storage medium for measuring the thickness of a battery cell. The method can avoid the adverse effects of environmental factors and human factors during the battery cell thickness measurement process, which is conducive to improving the accuracy of thickness measurement.

[0005] In a first aspect, the present application provides a method for measuring the thickness of a battery cell, which comprises the following steps: S10, obtaining a first pressure applied by a lifting mechanism to a pressing mechanism to a battery cell to be tested; S20, when it is determined that the first pressure reaches a first preset pressure, controlling the pressing mechanism to stop moving and obtaining a first control voltage of the lifting mechanism; S30, determining the thickness of the battery cell to be tested based on the first control voltage and a preset function of thickness and voltage.

[0006] In an optional embodiment, step S10 includes: a pressure detection device, the pressure detection device including a support platform, a lifting mechanism, a pressing mechanism and a pressure measuring device; wherein, the support platform is used to place the battery cell to be tested, the lifting mechanism is used to drive the pressing mechanism to move up and down above the support platform, and the pressure measuring device is used to detect a first pressure applied by the pressing mechanism to the battery cell to be tested; the pressure detection device responds to the thickness measurement instruction, controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested.

[0007] In an optional embodiment, the pressure detection device also includes a first measuring device and a plurality of reference blocks of different thicknesses, the number of the reference blocks is at least three, the first measuring device is arranged on one side of the pressing mechanism, and is used to measure the distance information between the pressing mechanism and the support platform; the battery cell thickness measurement method also includes: constructing a preset function; constructing the preset function includes: for each reference block, controlling the lifting mechanism to drive the pressing mechanism to move to the upper surface of the reference block; when it is determined that the second pressure applied by the pressing mechanism to the reference block detected by the pressure measuring device reaches the second preset pressure corresponding to the reference block, obtaining the second control voltage of the lifting mechanism to obtain the voltage parameter corresponding to the reference block, obtaining the thickness of the reference block to obtain the thickness parameter corresponding to the reference block, and obtaining the distance information measured by the first measuring device to obtain the spacing parameter corresponding to the reference block; taking the voltage parameter, thickness parameter and spacing parameter corresponding to each reference block as a data group to obtain multiple data groups; when it is determined that the thickness parameter in each data group is consistent with the spacing parameter, determining the slope and constant of the preset function according to the voltage parameters and thickness parameters in the multiple data groups; determining the preset function according to the slope and constant.

[0008] In an optional embodiment, determining the preset function according to the slope and the constant includes: correcting the constant according to the voltage parameters in the plurality of data groups and the sensitivity of the first measuring device; and determining the preset function according to the corrected constant and the slope.

[0009] In an optional embodiment, the pressure detection device also includes a second measuring device, which is used to obtain the upper surface area of ​​the battery cell to be tested; the battery cell thickness measurement method also includes: determining a first preset pressure; determining the first preset pressure includes: obtaining the upper surface area of ​​the battery cell to be tested collected by the second measuring device; determining the first preset pressure according to the upper surface area, the pressure coefficient corresponding to the downward pressure mechanism and the atmospheric pressure.

[0010] In an optional embodiment, the pressing mechanism includes a first pressing plate and a second pressing plate, the lifting mechanism is used to drive the first pressing plate and the second pressing plate to move up and down above the support platform, and the pressure measuring device is arranged between the first pressing plate and the second pressing plate.

[0011] In an optional embodiment, the pressure detection device also includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are arranged on the support platform, the first clamping plate is connected to the positive pole of the charging and discharging device, and the second clamping plate is connected to the negative pole of the charging and discharging device.

[0012] In a second aspect, the present application provides a battery cell thickness measuring device, the battery cell thickness measuring device comprising:

[0013] A control module, used for obtaining a first pressure applied by the lifting mechanism to the pressing mechanism to the battery cell to be tested;

[0014] A voltage acquisition module, used to control the pressing mechanism to stop moving and acquire a first control voltage of the lifting mechanism when it is determined that the first pressure reaches a first preset pressure;

[0015] The thickness determination module is used to determine the thickness of the battery cell to be tested according to the first control voltage and a preset function of thickness and voltage.

[0016] In an optional embodiment, the control module includes a pressure detection device, which includes a support platform, a lifting mechanism, a pressing mechanism and a pressure measuring device; wherein the support platform is used to place the battery cell to be tested, the lifting mechanism is used to drive the pressing mechanism to move up and down above the support platform, and the pressure measuring device is used to detect a first pressure applied by the pressing mechanism to the battery cell to be tested; the pressure detection device responds to the thickness measurement instruction, controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested.

[0017] In an optional embodiment, the pressure detection device also includes a first measuring device and a plurality of reference blocks of different thicknesses, the number of the reference blocks is at least three. The first measuring device is arranged on one side of the pressing mechanism, and is used to measure the distance information between the pressing mechanism and the support platform.

[0018] In an optional embodiment, the battery cell thickness measuring device further includes: a function construction unit, configured to construct a preset function;

[0019] Function building blocks include:

[0020] The control subunit controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of each reference gauge block;

[0021] a parameter acquisition subunit, for acquiring a second control voltage of the lifting mechanism to obtain a voltage parameter corresponding to the reference gauge block, acquiring a thickness of the reference gauge block to obtain a thickness parameter corresponding to the reference gauge block, and acquiring distance information measured by the first measuring device to obtain a spacing parameter corresponding to the reference gauge block when it is determined that the second pressure applied to the reference gauge block by the pressing mechanism detected by the pressure measuring device reaches a second preset pressure corresponding to the reference gauge block;

[0022] The parameter arrangement subunit is used to treat the voltage parameter, thickness parameter and spacing parameter corresponding to each reference gauge block as one data group to obtain multiple data groups;

[0023] A parameter calculation subunit, for determining a slope and a constant of a preset function according to voltage parameters and thickness parameters in a plurality of data groups when it is determined that the thickness parameter in each data group is consistent with the spacing parameter;

[0024] The function construction subunit is used to determine a preset function according to a slope and a constant.

[0025] In an optional embodiment, the function construction subunit is specifically configured to correct the constant according to the voltage parameters in the plurality of data groups and the sensitivity of the first measuring device, and determine the preset function according to the corrected constant and the slope.

[0026] In an optional embodiment, the pressure detection device further includes a second measuring device, and the second measuring device is used to obtain the upper surface area of ​​the battery cell to be tested.

[0027] In an optional embodiment, the battery cell thickness measuring device further includes:

[0028] A pressure calculation unit, used to determine a first preset pressure;

[0029] The pressure calculation unit includes:

[0030] A size acquisition subunit, used to acquire the upper surface area of ​​the battery cell to be tested collected by the second measuring device;

[0031] The pressure calculation subunit is used to determine the first preset pressure according to the upper surface area, the pressure coefficient corresponding to the downward pressure mechanism and the atmospheric pressure.

[0032] In an optional embodiment, the pressing mechanism includes a first pressing plate and a second pressing plate, the lifting mechanism is used to drive the first pressing plate and the second pressing plate to move up and down above the support platform, and the pressure measuring device is arranged between the first pressing plate and the second pressing plate.

[0033] In an optional embodiment, the pressure detection device also includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are arranged on the support platform, the first clamping plate is connected to the positive pole of the charging and discharging device, and the second clamping plate is connected to the negative pole of the charging and discharging device.

[0034] In a third aspect, the present application provides an electronic device, comprising a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, so that the electronic device executes the cell thickness measurement method in the first aspect or any possible implementation of the first aspect.

[0035] In a fourth aspect, the present application provides a computer program product, which includes: a computer program code, when the computer program code is run on a computer, the computer executes the battery cell thickness measurement method in the above-mentioned first aspect or any possible implementation of the first aspect.

[0036] In a fifth aspect, the present application provides a computer-readable storage medium storing a computer program code. When the computer program code runs on a computer, the computer executes the battery cell thickness measurement method in the above-mentioned first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic flow chart of a cell thickness measurement method provided in an embodiment of the present application is shown;

[0038] Figure 2 An exemplary schematic diagram of a pressure detection device is shown;

[0039] Figure 3 An exemplary schematic diagram of a lifting mechanism is shown;

[0040] Figure 4 A schematic diagram showing reference gauge blocks of different thicknesses;

[0041] Figure 5 An exemplary schematic diagram of a preset function is shown;

[0042] Figure 6 Another exemplary schematic diagram of a pressure detection device is shown;

[0043] Figure 7 An exemplary schematic diagram of a support table is shown;

[0044] Figure 8 A schematic structural diagram of a battery thickness measuring device provided in an embodiment of the present application is shown;

[0045] Fig. 9 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0046] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0047] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0048] The following is an embodiment of a method for measuring thickness of a battery cell provided in an embodiment of the present application.

[0049] Figure 1A schematic flow chart of a cell thickness measurement method provided in an embodiment of the present application is shown. Figure 1 As shown, the battery cell thickness measurement method provided in the embodiment of the present application is applied to a battery cell thickness measurement device. The battery cell thickness measurement device can realize online thickness measurement of the target object. The battery cell thickness measurement device includes a lifting mechanism and a pressing mechanism. The lifting mechanism can drive the lifting mechanism to move up and down in the vertical direction. When the thickness of the target object needs to be measured, the target object is placed still, and the lifting mechanism drives the pressing mechanism to move vertically downward. After the pressing mechanism contacts the target object, it will apply pressure to the target object, thereby realizing the thickness measurement of the target object. The battery cell thickness measurement device can be applied to the thickness measurement of the battery cell, and the battery cell thickness measurement method includes the following schemes:

[0050] S10, obtaining a first pressure applied by the lifting mechanism to the battery cell to be tested by the pressing mechanism;

[0051] S20, when it is determined that the first pressure reaches the first preset pressure, controlling the pressing mechanism to stop moving and obtaining a first control voltage of the lifting mechanism;

[0052] S30, determining the thickness of the battery cell to be tested according to the first control voltage and a preset function of thickness and voltage.

[0053] In an exemplary embodiment, when a battery cell thickness measuring device is used to measure the thickness of a battery cell to be tested, the battery cell to be tested is first placed statically under a pressing mechanism. The battery cell to be tested statically placed under the pressing mechanism can be a battery cell that has been fully charged, a battery cell that has been fully discharged, a battery cell that is being charged, or a battery cell that is being discharged.

[0054] This embodiment is described by taking the battery cell to be tested that is statically placed under the pressing mechanism as a battery cell that has been fully charged. After the battery cell to be tested is statically placed under the pressing mechanism, the battery cell thickness measuring device controls the lifting mechanism to drive the pressing mechanism to move toward the battery cell to be tested. After the pressing mechanism contacts the upper surface of the battery cell to be tested, the first pressure applied to the battery cell to be tested is obtained. At this time, the first pressure applied by the lifting mechanism to the pressing mechanism to the battery cell to be tested is obtained. The pressure that each battery cell can withstand when fully charged is certain. Once the pressure is greater than the bearing range, the battery cell will be damaged. Therefore, each fully charged battery cell corresponds to a maximum pressure that it can withstand. Based on this, for each battery cell produced, the maximum pressure that it can withstand when fully charged is calibrated in advance for each battery cell, that is, each battery cell is associated with a maximum pressure that it can withstand.

[0055] After obtaining the first pressure, the maximum pressure associated with the battery cell to be tested is obtained, which is called the first preset pressure, and it is determined whether the first pressure reaches the first preset pressure. If the first pressure does not reach the first preset pressure, the lifting mechanism drives the pressing mechanism to continue to move, thereby increasing the first pressure applied to the battery cell to be tested; if the first pressure reaches the first preset pressure, it means that the pressure applied by the pressing mechanism to the battery cell to be tested has reached the maximum pressure that the fully charged battery cell to be tested can withstand, and the pressing mechanism is controlled to stop moving. At this time, the pressing mechanism no longer increases the pressure applied to the battery cell to be tested, that is, when the pressing mechanism stops moving, the pressure applied by the pressing mechanism to the battery cell to be tested is equal to the first preset pressure, thereby obtaining the first control voltage of the lifting mechanism when the pressing mechanism stops moving.

[0056] A preset function of thickness and voltage is constructed in advance, and the voltage in the preset function includes multiple control voltages for the lifting mechanism, each control voltage is the voltage corresponding to the maximum pressure that the target object can withstand when the pressing mechanism applies to the target object after the lifting mechanism drives the pressing mechanism to contact the target object; the thickness in the preset function includes multiple control voltages, each corresponding to a thickness, that is, each thickness is the thickness of the target object measured when the pressing mechanism applies to the target object the maximum pressure that the target object can withstand after the lifting mechanism drives the pressing mechanism to contact the target object according to the corresponding control voltage. Among them, the preset function is a linear function of thickness and voltage, and after obtaining the first control voltage of the lifting mechanism when the pressing mechanism stops moving, the first control voltage is substituted into the preset function to obtain the thickness of the battery cell to be measured, thereby realizing the indirect measurement of the thickness of the battery cell to be measured, which is conducive to improving the thickness measurement efficiency of the battery cell, and can also avoid the influence of environmental factors (such as ambient temperature) and human factors on the thickness measurement of the battery cell, and improve the accuracy and measurement precision of the thickness measurement.

[0057] The embodiment of the present application adopts a technical solution of obtaining the first pressure applied by the lifting mechanism to the battery cell to be tested by driving the pressing mechanism, controlling the pressing mechanism to stop moving when it is determined that the first pressure reaches the first preset pressure, obtaining the first control voltage of the lifting mechanism, and determining the thickness of the battery cell to be tested according to the first control voltage and the preset function of thickness and voltage. The technical solution is suitable for measuring the thickness of battery cells and can realize real-time monitoring of the thickness change of the battery cell during charging and discharging. During the thickness measurement process, if it is detected that the pressure applied by the lifting mechanism to the battery cell driven by the pressing mechanism reaches the preset pressure, indicating that the pressure applied by the pressing mechanism to the battery cell reaches the maximum pressure that the battery cell can withstand, the pressing mechanism is controlled to stop applying the pressure to the battery cell, the control voltage of the lifting mechanism when the pressing mechanism stops moving is obtained, and the thickness of the battery cell is calculated according to the control voltage and the preset function of thickness and voltage, thereby realizing the measurement of the thickness of the battery cell, eliminating the process of using a thickness detection device to detect the thickness of the battery cell, reducing the amount of data calculation, and being conducive to improving the efficiency of battery cell thickness measurement. Since the thickness of the battery cell is obtained based on the voltage and the preset function, the adverse effects of environmental factors (such as ambient temperature) and human factors on the measurement of the battery cell thickness can be avoided, which is conducive to improving the accuracy and measurement precision of the thickness measurement.

[0058] The following Figure 1 The specific implementation methods of each step in the illustrated embodiment are described as follows:

[0059] In a possible implementation, the above step S10 includes the following solutions:

[0060] A pressure detection device comprises a support platform, a lifting mechanism, a pressing mechanism and a pressure measuring device; wherein the support platform is used to place a battery cell to be tested, the lifting mechanism is used to drive the pressing mechanism to move up and down above the support platform, and the pressure measuring device is used to detect a first pressure applied by the pressing mechanism to the battery cell to be tested; the pressure detection device responds to a thickness measurement instruction and controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested.

[0061] like Figure 2 As shown, Figure 2 An exemplary schematic diagram of a pressure detection device is shown. The battery cell thickness measuring device includes a pressure detection device, which includes a support platform 100, a lifting mechanism 200, a pressing mechanism 300 and a pressure measuring device 400. The support platform 100 is used to place the battery cell to be tested, and P represents the battery cell to be tested. The lifting mechanism 200 is used to drive the pressing mechanism 300 to move up and down above the support platform 100. The structure of the lifting mechanism 200 has various types. One implementation method, such as Figure 3 As shown, Figure 3An exemplary schematic diagram of a lifting mechanism is shown. The lifting mechanism 200 includes a slide rail 201, a drive motor 202, and a screw rod 203. The slide rail 201 is vertically arranged on the upper surface of the support platform 100. The drive motor 202 is arranged at one end of the slide rail 201 away from the upper surface of the support platform 100. The drive motor 202 is used to drive the screw rod 203 to rotate. The pressing mechanism 300 is threadedly connected to the pressing mechanism 300 and is slidably connected to the slide rail 201. When the drive motor 202 drives the screw rod 203 to rotate, the pressing mechanism 300 moves up and down above the support platform 100. The slide rail 201 can play a supporting role on the one hand, and can also play a guiding role for the pressing mechanism 300. For example, the driving motor 202 rotates forward, and the pressing mechanism 300 moves downward along the slide rail 201, that is, the distance between the pressing mechanism 300 and the support platform 100 decreases. The driving motor 202 rotates reversely, and the pressing mechanism 300 moves upward along the slide rail 201, that is, the distance between the pressing mechanism 300 and the support platform 100 increases. In another implementation, the lifting mechanism 200 includes a support frame and an electric telescopic rod, and the support frame is located above the support platform 100 and is used to fix the electric telescopic rod. The telescopic end of the electric telescopic rod is fixedly connected to the pressing mechanism 300, that is, when the electric telescopic rod is extended, the pressing mechanism 300 moves downward, that is, the distance between the pressing mechanism 300 and the support platform 100 decreases, and when the electric telescopic rod is shortened, the pressing mechanism 300 moves upward, that is, the distance between the pressing mechanism 300 and the support platform 100 increases.

[0062] The pressure measuring device 400 is, for example, a pressure sensor, which is used to detect the first pressure applied by the pressing mechanism 300 to the battery cell to be tested. During the battery cell thickness measurement, if the pressure detection device receives a thickness measurement instruction, it responds to the thickness measurement instruction, and then controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested, so as to make contact with the battery cell to be tested. At this time, the pressure measuring device set on the pressing mechanism will detect the first pressure applied by the pressing mechanism to the battery cell to be tested, and transmit the detected first pressure to the pressure detection device, so that the pressure detection device obtains the first pressure applied by the pressing mechanism to the battery cell to be tested, that is, the battery cell thickness measurement device obtains the first pressure applied by the pressing mechanism to the battery cell to be tested.

[0063] On the one hand, the battery thickness measuring device is provided with a thickness measuring button, and the inspector can issue a thickness measuring instruction by pressing the thickness measuring button; on the other hand, the battery thickness measuring device is connected to the charging and discharging equipment used for charging and discharging the battery cell, realizing the software association between the battery thickness measuring device and the charging and discharging equipment. The battery thickness measuring device and the charging and discharging equipment use Modbus TCP (Transmission Control Protocol) for communication, and the charging and discharging equipment is connected to the battery thickness measuring device through a network-to-serial communication module, and the communication connection method is realized by R232 / R485. The inspector can send a thickness measuring instruction to the battery thickness measuring device through the charging and discharging equipment, and then the thickness of the battery cell measured by the battery thickness measuring device can be transmitted to the charging and discharging equipment for recording and display.

[0064] In one possible implementation, Figure 2 As shown, the pressure detection device also includes a first measuring device 500 and a plurality of reference gauge blocks of different thicknesses, the number of the reference gauge blocks is at least three, the first measuring device 500 is, for example, a displacement sensor, also known as a grating ruler, arranged on one side of the pressing mechanism 300, and used to measure the distance information between the pressing mechanism 300 and the support platform 100. Among them, the number of the plurality of reference gauge blocks of different thicknesses is at least 3, and the design of the reference gauge block includes multiple ways. On the one hand, the thickness of the fully charged battery cell is taken as the middle value, and then a plurality of values ​​less than the middle value and a plurality of values ​​greater than the middle value are taken, so that the middle value, a plurality of values ​​less than the middle value, and a plurality of values ​​greater than the middle value are taken as the design thickness of the reference gauge block, thereby designing a plurality of reference gauge blocks of different thicknesses, the number of the reference gauge blocks is at least three, wherein the difference between the plurality of values ​​less than the middle value and the plurality of values ​​greater than the middle value and the middle value should be within a reasonable range and cannot exceed a reasonable range, and the thickness of the reference gauge block with the smallest thickness cannot be less than the thickness of the battery cell that is not charged. On the other hand, the thickness of multiple reference quantities can be designed based on the thickness of uncharged battery cells, the thickness of battery cells being charged and in different charging stages, and the thickness of fully charged battery cells, that is, the thickness of the smallest reference quantity block among the multiple reference quantities cannot be less than the thickness of the uncharged battery cells.

[0065] like Figure 4 As shown, Figure 4 A schematic diagram of reference gauge blocks of different thicknesses is shown, where H1, H2, and H3 represent reference gauge blocks of different thicknesses, respectively.

[0066] The above-mentioned cell thickness measurement method also includes the following schemes:

[0067] Construct a preset function. The process of constructing a preset function is as follows:

[0068] For each reference gauge block, the lifting mechanism is controlled to drive the pressing mechanism to move to the upper surface of the reference gauge block;

[0069] When it is determined that the second pressure applied by the pressing mechanism to the reference gauge block detected by the pressure measuring device reaches the second preset pressure corresponding to the reference gauge block, the second control voltage of the lifting mechanism is obtained to obtain the voltage parameter corresponding to the reference gauge block, the thickness of the reference gauge block is obtained to obtain the thickness parameter corresponding to the reference gauge block, and the distance information measured by the first measuring device is obtained to obtain the spacing parameter corresponding to the reference gauge block;

[0070] The voltage parameter, thickness parameter and spacing parameter corresponding to each reference gauge block are taken as a data group to obtain multiple data groups;

[0071] When it is determined that the thickness parameter in each data group is consistent with the spacing parameter, the slope and constant of the preset function are determined according to the voltage parameters and thickness parameters in the plurality of data groups;

[0072] Based on the slope and constant, determine the preset function.

[0073] For each reference gauge block, the lifting mechanism is controlled to drive the pressing mechanism to move to the upper surface of the reference gauge block, thereby contacting the reference gauge block, and the second pressure applied by the pressing mechanism to the reference gauge block is detected by the pressure measuring device. If the second pressure reaches the second preset pressure corresponding to the reference gauge block, then when the second pressure reaches the second preset pressure corresponding to the reference gauge block, the second control voltage of the lifting mechanism is obtained to obtain the voltage parameter corresponding to the reference gauge block, the thickness of the reference gauge block is obtained to obtain the thickness parameter corresponding to the reference gauge block, and the distance information measured by the first measuring device is obtained to obtain the spacing parameter corresponding to the reference gauge block. After obtaining the voltage parameter, thickness parameter and spacing parameter corresponding to each reference gauge block, the voltage parameter, thickness parameter and spacing parameter corresponding to each reference gauge block are taken as a data group, thereby obtaining multiple data groups, that is, each data group includes three parameters. Wherein, the number of reference gauge blocks is at least 3, and the multiple data groups obtained include at least 3 groups.

[0074] After obtaining multiple data sets, determine whether the thickness parameters and spacing parameters in each data set are the same. If the two are the same, determine the slope and constant of the preset function based on the voltage parameters and thickness parameters in the multiple data sets and the basic formula of the linear function. That is, take the slope and constant in the basic formula of the linear function as unknowns. The basic formula is y=kx+b, k is the slope, and b is the constant. Construct a system of equations using the voltage parameters and thickness parameters in the multiple data sets. After solving the system of equations, obtain the slope and constant of the preset function, and then generate the preset function based on the obtained slope and constant. Figure 5 As shown, Figure 5An exemplary schematic diagram of a preset function is shown, where L represents the waveform of the preset function, the X-axis represents thickness, the Y-axis represents voltage, and the correlation coefficient between voltage and thickness is represented by R, R 2 =1, the preset function is y=0.9983x-1.4832, the slope is 0.9983, and the constant is -1.4832, that is, the relationship between thickness and voltage represented by the preset function is a straight line with a slope of 0.9983.

[0075] In a possible implementation, the above-mentioned determining the preset function according to the slope and the constant includes the following scheme:

[0076] Correcting the constant based on the voltage parameters in the plurality of data sets and the sensitivity of the first measurement device;

[0077] The preset function is determined according to the corrected constant and slope.

[0078] The accuracy of the pressure detected by the first measuring device is related to the sensitivity of the first measuring device. The size of the sensitivity has a certain relationship with the error of the detected pressure. For example, if the sensitivity is greater than the first threshold, the detected pressure will be too large. On the contrary, if the sensitivity is lower than the second threshold, the detected pressure will be too small. If the sensitivity is between the first threshold and the second threshold, the detected pressure is close to the actual pressure, wherein the first threshold is greater than the second threshold. Since the battery cell thickness measuring device controls the pressure applied by the pressing mechanism driven by the lifting mechanism according to the control voltage, in order to ensure the accuracy of the constructed preset function, the constant of the preset function is corrected according to the voltage parameters in multiple data groups and the sensitivity of the first measuring device to obtain the corrected constant, and then the preset function is generated according to the corrected constant and the slope, which is conducive to improving the accuracy of the battery cell thickness measurement.

[0079] In a possible implementation, the pressure detection device further includes a second measuring device, such as a camera, for obtaining the upper surface area of ​​the battery cell to be tested. The battery cell thickness measurement method further includes the following solutions:

[0080] Determine the first preset pressure. The process of determining the first preset pressure is as follows:

[0081] Obtaining the upper surface area of ​​the battery cell to be tested collected by the second measuring device;

[0082] The first preset pressure is determined according to the upper surface area, the pressure coefficient corresponding to the pressing mechanism and the atmospheric pressure.

[0083] Usually, the shape of the battery cell to be tested is regular, for example, the shape of the battery cell to be tested is a regular cuboid, then the upper surface of the shape of the battery cell to be tested is a rectangle, and the upper surface area of ​​the battery cell to be tested collected by the second measuring device is obtained, that is, the area of ​​the upper surface of the battery cell to be tested, which is calculated by the length and width of the upper surface, and then the first preset pressure is calculated according to the upper surface area, the pressure coefficient corresponding to the downward pressure mechanism and the atmospheric pressure. The calculation formula of the first preset pressure is as follows:

[0084] F = m × p × s;

[0085] F represents pressure, m represents the pressure coefficient corresponding to the downward pressure mechanism, p represents atmospheric pressure, and s represents the upper surface area. Among them, the second preset pressure corresponding to the above-mentioned reference block can also be obtained through the calculation formula. It is worth noting that the battery cell thickness measurement method provided in the present application is also applicable to irregularly shaped battery cells such as T-shaped and L-shaped. When calculating the first preset pressure corresponding to the irregularly shaped battery cell, the contour size information of the upper surface of the irregularly shaped battery cell can be obtained through the second measuring device, and the upper surface is divided into multiple regular graphics according to the contour size information. The areas of the multiple graphics are summed to obtain the upper surface area of ​​the irregularly shaped battery cell.

[0086] In one possible implementation, Figure 6 As shown, Figure 6 Another exemplary schematic diagram of the pressure detection device is shown. The pressing mechanism 300 includes a first pressing plate 301 and a second pressing plate 302. The lifting mechanism 200 is used to drive the first pressing plate 301 and the second pressing plate 302 to move up and down above the support platform 100. The pressure measuring device 400 is installed between the first pressing plate 301 and the second pressing plate 302, and contacts the first pressing plate 301 and the second pressing plate 302 respectively. Since the pressure measuring device 400 is installed between the first pressing plate 301 and the second pressing plate 302, after the second pressing plate 302 contacts the battery cell to be tested, the pressure measuring device 400 will not contact the battery cell to be tested, which can improve the accuracy of detecting the first pressure applied by the pressing mechanism 300 to the battery cell to be tested.

[0087] In one possible implementation, Figure 7 As shown, Figure 7An exemplary schematic diagram of a support platform is shown. The pressure detection device also includes a first clamping plate and a second clamping plate. The first clamping plate 101 and the second clamping plate 102 are arranged on the support platform 100. The first clamping plate 101 and the second clamping plate 102 can both be conductive. The first clamping plate 101 is connected to the positive electrode of the charging and discharging device, and the second clamping plate 102 is connected to the negative electrode of the charging and discharging device. Among them, the height of the first clamping plate 101 and the second clamping plate 102 is lower than the thickness of the battery cell to be tested. The first clamping plate 101 and the second clamping plate 102 form a clamping groove, and the battery cell to be tested is placed between the first clamping plate 101 and the second clamping plate 102. The first clamping plate 101 and the second clamping plate 102 can limit the battery cell to be tested to prevent the battery cell to be tested from moving during the thickness detection, thereby improving the stability of the thickness detection device of the battery cell to be tested, and reducing the friction between the battery cell to be tested and the support platform and the pressing mechanism. Since the first clamping plate 101 is connected to the positive pole of the charging and discharging equipment, and the second clamping plate 102 is connected to the negative pole of the charging and discharging equipment, after the battery cell to be tested is placed between the first clamping plate 101 and the second clamping plate 102, the battery cell to be tested can be charged and discharged by the charging and discharging equipment, thereby achieving real-time detection of the battery cell thickness of the battery cell to be tested during the charging and discharging of the battery cell to be tested, thereby achieving real-time monitoring of the change in battery cell thickness during the charging and discharging process.

[0088] The battery thickness measuring device also includes an automatic calibration mechanism, which is used for self-checking and calibrating the zero position.

[0089] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0090] Figure 8 FIG. 1 is a schematic diagram showing the structure of a battery thickness measuring device provided in an embodiment of the present application. Figure 8 As shown, the battery cell thickness measuring device 800 includes:

[0091] A control module 810 is used to obtain a first pressure applied by the lifting mechanism to the battery cell to be tested by driving the pressing mechanism;

[0092] The voltage acquisition module 820 is used to control the pressing mechanism to stop moving and acquire the first control voltage of the lifting mechanism when it is determined that the first pressure reaches the first preset pressure;

[0093] The thickness determination module 830 is used to determine the thickness of the battery cell to be tested according to the first control voltage and a preset function of thickness and voltage.

[0094] In one possible implementation, the control module 810 includes a pressure detection device, which includes a support platform, a lifting mechanism, a pressing mechanism and a pressure measuring device; wherein the support platform is used to place the battery cell to be tested, the lifting mechanism is used to drive the pressing mechanism to move up and down above the support platform, and the pressure measuring device is used to detect a first pressure applied by the pressing mechanism to the battery cell to be tested; the pressure detection device responds to the thickness measurement instruction, controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested.

[0095] In a possible implementation, the pressure detection device 800 further includes a first measuring device and a plurality of reference blocks of different thicknesses, the number of the reference blocks being at least three, the first measuring device being disposed on one side of the pressing mechanism, and being used to measure the distance information between the pressing mechanism and the support platform; the battery cell thickness measuring device 800 further includes:

[0096] Function building unit, used to build preset functions;

[0097] Function building blocks include:

[0098] A control subunit is used for controlling the lifting mechanism to drive the pressing mechanism to move to the upper surface of each reference gauge block;

[0099] a parameter acquisition subunit, for acquiring a second control voltage of the lifting mechanism to obtain a voltage parameter corresponding to the reference gauge block, acquiring a thickness of the reference gauge block to obtain a thickness parameter corresponding to the reference gauge block, and acquiring distance information measured by the first measuring device to obtain a spacing parameter corresponding to the reference gauge block when it is determined that the second pressure applied to the reference gauge block by the pressing mechanism detected by the pressure measuring device reaches a second preset pressure corresponding to the reference gauge block;

[0100] The parameter arrangement subunit is used to treat the voltage parameter, thickness parameter and spacing parameter corresponding to each reference gauge block as one data group to obtain multiple data groups;

[0101] A parameter calculation subunit, for determining a slope and a constant of a preset function according to voltage parameters and thickness parameters in a plurality of data groups when it is determined that the thickness parameter in each data group is consistent with the spacing parameter;

[0102] The function construction subunit is used to determine a preset function according to a slope and a constant.

[0103] In a possible implementation, the function construction subunit is specifically configured to correct a constant according to voltage parameters in a plurality of data groups and the sensitivity of the first measurement device, and determine a preset function according to the corrected constant and slope.

[0104] In a possible implementation, the pressure detection device further includes a second measuring device, which is used to obtain the upper surface area of ​​the battery cell to be tested; the battery cell thickness measuring device 800 also includes:

[0105] A pressure calculation unit, used to determine a first preset pressure;

[0106] The pressure calculation unit includes:

[0107] A size acquisition subunit, used to acquire the upper surface area of ​​the battery cell to be tested collected by the second measuring device;

[0108] The pressure calculation subunit is used to determine the first preset pressure according to the upper surface area, the pressure coefficient corresponding to the downward pressure mechanism and the atmospheric pressure.

[0109] In a possible implementation, the pressing mechanism includes a first pressing plate and a second pressing plate, the lifting mechanism is used to drive the first pressing plate and the second pressing plate to move up and down above the support platform, and the pressure measuring device is arranged between the first pressing plate and the second pressing plate.

[0110] In a possible implementation, the pressure detection device also includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are arranged on the support platform, the first clamping plate is connected to the positive electrode of the charging and discharging device, and the second clamping plate is connected to the negative electrode of the charging and discharging device.

[0111] It should be noted that the battery cell thickness measuring device provided in the above embodiment only uses the division of the above functional modules as an example when executing the battery cell thickness measuring method. In actual applications, the above functional distribution can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the battery cell thickness measuring device provided in the above embodiment and the battery cell thickness measuring method embodiment belong to the same concept. Therefore, for details not disclosed in the device embodiment of the present application, please refer to the above-mentioned battery cell thickness measuring method embodiment of the present application, which will not be repeated here.

[0112] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0113] Fig. 9 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown.

[0114] For example, Fig. 9 As shown, the electronic device 900 includes: a memory 901 and a processor 902, wherein the memory 901 stores an executable program code 9011, and the processor 902 is used to call and execute the executable program code 9011 to perform a battery cell thickness measurement method.

[0115] In this embodiment, the electronic device can be divided into functional modules according to the above method example. For example, each functional module can be corresponded to, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0116] In the case of dividing each functional module according to each function, the electronic device may include: a control module, a voltage acquisition module, a thickness determination module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

[0117] The electronic device provided in this embodiment is used to execute the above-mentioned method for measuring the thickness of a battery cell, and thus can achieve the same effect as the above-mentioned implementation method.

[0118] In the case of an integrated unit, the electronic device may include a processing module and a storage module. The processing module may be used to control and manage the actions of the electronic device. The storage module may be used to support the electronic device in executing mutual program codes and data.

[0119] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits disclosed in the present application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0120] This embodiment further provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a battery cell thickness measurement method in the above-mentioned embodiment.

[0121] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement a battery cell thickness measurement method in the above-mentioned embodiment.

[0122] In addition, the electronic device provided in the embodiments of the present application may specifically be a chip, a component or a module, and the electronic device may include a connected processor and a memory; wherein the memory is used to store instructions, and when the electronic device is running, the processor may call and execute instructions so that the chip executes a battery cell thickness measurement method in the above-mentioned embodiments.

[0123] Among them, the electronic device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding battery cell thickness measurement method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding battery cell thickness measurement method provided above, and will not be repeated here.

[0124] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0125] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for measuring the thickness of a battery cell, characterized in that: The cell thickness measurement method comprises the steps of: S10, obtaining a first pressure applied by the lifting mechanism to the battery cell to be tested by the pressing mechanism; S20, when it is determined that the first pressure reaches a first preset pressure, controlling the pressing mechanism to stop moving, and obtaining a first control voltage of the lifting mechanism; S30, determining the thickness of the battery cell to be tested according to the first control voltage and a preset function of thickness and voltage.

2. The method for measuring thickness of a battery cell according to claim 1, characterized in that: The step S10 includes: A pressure detection device, comprising a support platform, a lifting mechanism, a pressing mechanism and a pressure measuring device; wherein the support platform is used to place a battery cell to be tested, the lifting mechanism is used to drive the pressing mechanism to move up and down above the support platform, and the pressure measuring device is used to detect a first pressure applied by the pressing mechanism to the battery cell to be tested; The pressure detection device controls the lifting mechanism to drive the pressing mechanism to move to the upper surface of the battery cell to be tested in response to the thickness measurement instruction.

3. The method for measuring thickness of a battery cell according to claim 2, characterized in that: The pressure detection device further includes a first measuring device and a plurality of reference blocks of different thicknesses, the number of the reference blocks being at least three, the first measuring device being disposed on one side of the pressing mechanism and being used to measure the distance information between the pressing mechanism and the support platform; The battery cell thickness measurement method further includes: constructing the preset function; The constructing of the preset function comprises: For each of the reference gauge blocks, controlling the lifting mechanism to drive the pressing mechanism to move to the upper surface of the reference gauge block; When it is determined that the second pressure applied by the pressing mechanism to the reference gauge block detected by the pressure measuring device reaches the second preset pressure corresponding to the reference gauge block, the second control voltage of the lifting mechanism is obtained to obtain the voltage parameter corresponding to the reference gauge block, the thickness of the reference gauge block is obtained to obtain the thickness parameter corresponding to the reference gauge block, and the distance information measured by the first measuring device is obtained to obtain the spacing parameter corresponding to the reference gauge block; Taking the voltage parameter, thickness parameter and spacing parameter corresponding to each of the reference gauge blocks as a data group, and obtaining a plurality of the data groups; When it is determined that the thickness parameter in each of the data groups is consistent with the spacing parameter, determining the slope and constant of the preset function according to the voltage parameters and the thickness parameters in the plurality of data groups; The preset function is determined according to the slope and the constant.

4. The method for measuring thickness of a battery cell according to claim 3, characterized in that: Determining the preset function according to the slope and the constant includes: Correcting the constant according to the voltage parameters in the plurality of data sets and the sensitivity of the first measuring device; The preset function is determined according to the corrected constant and the slope.

5. The method for measuring thickness of a battery cell according to any one of claims 2 to 4, characterized in that: The pressure detection device further includes a second measuring device, which is used to obtain the upper surface area of ​​the battery cell to be tested; The battery cell thickness measurement method further includes: determining the first preset pressure; Determining the first preset pressure includes: Acquiring the upper surface area of ​​the battery cell to be tested collected by the second measuring device; The first preset pressure is determined according to the upper surface area, the pressure coefficient corresponding to the pressing mechanism and the atmospheric pressure.

6. The method for measuring thickness of a battery cell according to any one of claims 2 to 4, characterized in that: The pressing mechanism includes a first pressing plate and a second pressing plate, the lifting mechanism is used to drive the first pressing plate and the second pressing plate to move up and down above the supporting platform, and the pressure measuring device is arranged between the first pressing plate and the second pressing plate.

7. The method for measuring thickness of a battery cell according to any one of claims 2 to 4, characterized in that: The pressure detection device also includes a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are arranged on the support platform, the first clamping plate is connected to the positive electrode of the charging and discharging device, and the second clamping plate is connected to the negative electrode of the charging and discharging device.

8. A battery cell thickness measuring device, characterized in that: The battery thickness measuring device comprises: A control module, used for obtaining a first pressure applied by the lifting mechanism to the pressing mechanism to the battery cell to be tested; a voltage acquisition module, configured to control the pressing mechanism to stop moving and acquire a first control voltage of the lifting mechanism when it is determined that the first pressure reaches a first preset pressure; The thickness determination module is used to determine the thickness of the battery cell to be tested according to the first control voltage and a preset function of thickness and voltage.

9. An electronic device, characterized in that: The electronic device comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory, so that the electronic device executes the battery cell thickness measurement method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the battery cell thickness measurement method according to any one of claims 1 to 7 is implemented.

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