Same-side lug alignment method and device, computer device and storage medium

Abstract

The application relates to a same-side tab alignment method and device, computer equipment, a storage medium and a computer program product, and relates to the technical field of winding batteries. The method comprises the following steps: obtaining the current thickness of electrode material to be wound; obtaining the spacing offset of the current tab relative to the previous tab according to the thickness difference of the current thickness relative to the reference thickness; obtaining the current winding diameter, and obtaining the corresponding theoretical winding tension value according to the current winding diameter; obtaining the current winding tension value, and obtaining the spacing adjustment of the current tab relative to the previous tab according to the current winding tension value, the theoretical winding tension value and the spacing offset; obtaining the theoretical spacing of the current tab relative to the previous tab, and determining the alignment spacing of the tab alignment according to the theoretical spacing and the spacing adjustment. The method can obtain an accurate tab alignment spacing, and improve the qualified rate of the wound battery product.

Description

Technical Field

[0001] This application relates to the field of wound battery technology, and in particular to a method, apparatus, computer device, storage medium, and computer program product for aligning tabs on the same side. Background Technology

[0002] Factors affecting the unstable alignment of the same-side tabs in cylindrical cells include incoming materials and tension control. The tolerance of incoming electrode material is ±2 micrometers, and the tolerance of incoming diaphragm material is ±1 micrometer. Simulation shows that when this tolerance is at its maximum, the alignment requirement is no longer met. Therefore, under stable equipment tension control, incoming materials are the biggest influencing factor. The laser cutting size needs to be dynamically adjusted according to the thickness of the incoming material to ensure the alignment of the tabs after winding.

[0003] The existing method for controlling the alignment of the same-side tabs in cylindrical cells is to manually check the alignment error after winding, calculate the actual deviation of each tab, and then compensate for the calculated deviation within the laser cutting spacing to control the alignment of the same-side tabs. This method involves checking after the final winding is completed. However, there is a distance between the winding and unwinding point and the laser cutting point. If there is a problem with the actual alignment, the material supplied over this distance has already been wasted. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer device, computer-readable storage medium, and computer program product for aligning ipsilateral tabs to address the technical problem of inaccurate alignment of ipsilateral tabs.

[0005] Firstly, this application provides a method for aligning ipsilateral electrodes. The method includes:

[0006] Obtain the current thickness of the electrode material to be wound;

[0007] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0008] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0009] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0010] Obtain the theoretical distance between the current electrode tab and the previous electrode tab, and determine the alignment distance for electrode tab alignment based on the theoretical distance and the distance adjustment amount.

[0011] In one embodiment, obtaining the theoretical distance between the current electrode and the previous electrode includes:

[0012] Obtain the reference thickness, the first target winding angle of the current electrode tab in the electrode material, and the second target winding angle of the previous electrode tab in the electrode material;

[0013] Based on the reference thickness and the first target winding angle, the first target position of the current electrode tab on the electrode material is obtained;

[0014] Based on the reference thickness and the second target winding angle, the second target position of the first electrode tab on the electrode material is obtained;

[0015] The theoretical distance is determined based on the first target position and the second target position.

[0016] In one embodiment, determining the theoretical distance based on the first target position and the second target position includes:

[0017] Obtain the width of the first electrode corresponding to the current electrode and the width of the second electrode of the previous electrode;

[0018] The theoretical spacing is determined based on the width of the first electrode tab, the width of the second electrode tab, the first target position, and the second target position.

[0019] In one embodiment, determining the theoretical spacing based on the first electrode width, the second electrode width, the first target position, and the second target position includes:

[0020] The position of the front end of the current electrode is obtained based on the width of the first electrode and the first target position;

[0021] The position of the rear end of the first electrode is obtained based on the width of the second electrode and the second target position;

[0022] The theoretical spacing is determined based on the position of the front end of the electrode and the position of the rear end of the electrode.

[0023] In one embodiment, obtaining the spacing adjustment amount of the current electrode relative to the previous electrode based on the current winding tension value, the theoretical winding tension value, and the spacing offset includes:

[0024] Obtain the ratio between the theoretical winding tension and the current winding tension;

[0025] The product of the ratio and the spacing offset is obtained as the spacing adjustment amount of the current electrode relative to the previous electrode.

[0026] In one embodiment, obtaining the corresponding theoretical winding tension value based on the current roll diameter includes:

[0027] Obtain the winding diameter range, taper tension coefficient, and initial taper tension value of the electrode material;

[0028] The theoretical winding tension value for the incoming electrode material is determined based on the roll diameter range, the taper tension coefficient, the initial taper tension value, and the current roll diameter.

[0029] Secondly, this application also provides a same-side electrode alignment device. The device includes:

[0030] The thickness acquisition module is used to acquire the current thickness of the electrode material to be wound.

[0031] The offset acquisition module is used to obtain the spacing offset of the current electrode relative to the previous electrode based on the thickness difference between the current thickness and the reference thickness.

[0032] The roll diameter processing module is used to obtain the current roll diameter and, based on the current roll diameter, obtain the corresponding theoretical winding tension value.

[0033] The adjustment amount acquisition module is used to acquire the current winding tension value, and obtain the spacing adjustment amount of the current electrode relative to the previous electrode based on the current winding tension value, the theoretical winding tension value and the spacing offset.

[0034] The alignment spacing determination module is used to obtain the theoretical spacing between the current electrode and the previous electrode, and determine the alignment spacing for electrode alignment based on the theoretical spacing and the spacing adjustment amount.

[0035] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0036] Obtain the current thickness of the electrode material to be wound;

[0037] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0038] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0039] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0040] Obtain the theoretical distance between the current electrode tab and the previous electrode tab, and determine the alignment distance for electrode tab alignment based on the theoretical distance and the distance adjustment amount.

[0041] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0042] Obtain the current thickness of the electrode material to be wound;

[0043] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0044] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0045] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0046] Obtain the theoretical distance between the current electrode tab and the previous electrode tab, and determine the alignment distance for electrode tab alignment based on the theoretical distance and the distance adjustment amount.

[0047] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0048] Obtain the current thickness of the electrode material to be wound;

[0049] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0050] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0051] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0052] Obtain the theoretical distance between the current electrode tab and the previous electrode tab, and determine the alignment distance for electrode tab alignment based on the theoretical distance and the distance adjustment amount.

[0053] The aforementioned method, apparatus, computer equipment, storage medium, and computer program for aligning tabs on the same side obtains the current thickness of the incoming electrode material in real time, determines the theoretical offset of the spacing between the tabs based on the current thickness of the incoming electrode material, and determines the actual adjustment amount of the tab spacing based on the current winding tension value, thereby obtaining an accurate tab alignment spacing. This avoids the problem of incorrect tab cutting spacing and misalignment of tabs on the same side caused by changes in the thickness of the incoming material during the cell winding process, thus improving the yield rate of wound cell products. Attached Figure Description

[0054] Figure 1 This is an application environment diagram of the same-side electrode alignment method in one embodiment;

[0055] Figure 2 This is a flowchart illustrating a method for aligning the same-side tabs in one embodiment;

[0056] Figure 3 This is a flowchart illustrating the steps for determining the theoretical spacing in one embodiment;

[0057] Figure 4 This is a schematic diagram of the tabs in a wound battery cell in one embodiment;

[0058] Figure 5 This is a complete flowchart of the same-side electrode alignment method in another embodiment;

[0059] Figure 6 This is a structural block diagram of the same-side tab alignment device in one embodiment;

[0060] Figure 7 This is an internal structural diagram of the tab cutting control device in one embodiment. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0062] The same-side tab alignment method provided in this application embodiment can be applied to, for example... Figure 1In the application environment shown, the thickness measuring device 102 and the winding control device 103 communicate with the tab cutting control device 104 via a network. The tab cutting control device 104 includes a data memory and a microprocessor. The tab cutting control device 104 acquires the current thickness of the incoming material to be wound, measured by the thickness measuring device 102, and acquires the current winding diameter and current winding tension value sent by the winding control device 103. Then, based on the current tab and current winding diameter, it retrieves the theoretical spacing and theoretical winding tension value from the data memory, and finally calculates the alignment spacing between the tabs in actual operation to complete the tab cutting. The thickness measuring device 102 may include, but is not limited to, laser thickness measuring devices and ultrasonic thickness measuring devices. The winding control device 103 may be a programmable logic control system (PLC control system).

[0063] In one embodiment, such as Figure 2 As shown, a method for aligning the same-side pole ears is provided, which is then applied to... Figure 1 The following steps are used as an example to illustrate the electrode cutting control device 104:

[0064] Step 201: Obtain the current thickness of the electrode material to be wound.

[0065] Electrode material is the raw material used in winding the battery cell.

[0066] Furthermore, the electrode materials include positive electrode materials, negative electrode materials, and separator materials.

[0067] For example, the electrode cutting control device 104 obtains the current thickness data corresponding to the positive electrode material, negative electrode material and separator material through the thickness measuring device 102, and adds the current thickness of the three materials to obtain the current thickness data of the entire electrode material.

[0068] Step 202: Based on the thickness difference between the current thickness and the reference thickness, obtain the spacing offset of the current tab relative to the previous tab.

[0069] The reference thickness is the theoretical thickness of the incoming material without any tolerance.

[0070] For example, the tab cutting control device 104 obtains the user-preset reference thickness, calculates the thickness difference, and then calculates the spacing offset between the tabs according to the formula disclosed below.

[0071]

[0072] L0 needs to be determined based on the actual scenario, specifically satisfying the condition that L should be 0 when θ = 0 and r0 is the core radius. According to the physical meaning of the formula, the thickness difference is divided by 2π and substituted into parameter b in the formula (representing the increase in winding radius for each unit increase in the winding helix angle). Simultaneously, the winding angle difference between the tabs is substituted into parameter θ. The calculated L is the spacing offset. It should be noted that, generally, the winding angle difference between adjacent tabs aligned on the same side in a wound cell is 2π.

[0073] Step 203: Obtain the current roll diameter and, based on the current roll diameter, obtain the corresponding theoretical winding tension value.

[0074] The theoretical winding tension value is the winding tension value of the electrode material when it is wound at the reference thickness (ideal state).

[0075] Furthermore, there is a corresponding relationship between the winding tension value and the winding diameter; the winding tension value should decrease as the winding diameter increases.

[0076] For example, the electrode cutting control device 104 queries the user-preset initial theoretical winding tension value in the data storage and obtains the current winding diameter of the electrode from the winding control device 103. Based on the current winding diameter and the initial theoretical winding tension value, it calculates the theoretical winding tension value corresponding to the current winding diameter. The initial winding tension value is the winding tension value when the incoming material has the smallest winding diameter, i.e., the winding tension value at the beginning of winding. Further, the minimum winding diameter is determined by the radius of the core during specific operations. For example, if the core radius is 5 cm, then the winding diameter at the beginning of winding is 5 cm, which is the minimum winding diameter.

[0077] Step 204: Obtain the current winding tension value. Based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0078] For example, the electrode cutting control device 104 obtains the current winding tension value of the electrode winding from the winding control device 103, and obtains the spacing adjustment amount of the current electrode relative to the previous electrode based on the current winding tension value, the theoretical winding tension value, and the spacing offset. It should be noted that the winding tension value is the force applied to the incoming material. The magnitude of the winding tension value affects the tightness of the incoming material winding; the greater the winding tension, the tighter the winding, and vice versa. Therefore, the actual spacing adjustment amount is obtained based on the theoretical winding tension value and the actual current winding tension value.

[0079] Step 205: Obtain the theoretical distance between the current electrode and the previous electrode, and determine the alignment distance for electrode alignment based on the theoretical distance and the distance adjustment amount.

[0080] The theoretical spacing is the electrode cutting spacing at which the electrodes on the same side can be aligned after the electrode material is wound at the reference thickness (ideally).

[0081] For example, the tab cutting control device 104 adjusts the theoretical spacing according to the spacing adjustment amount to obtain the alignment spacing required for the current tab and the previous tab to be aligned in this actual operation. Subsequently, the tab cutting control device 104 can cut out the corresponding tab according to the alignment spacing.

[0082] In the aforementioned method for aligning tabs on the same side, the current thickness of the incoming electrode material is detected in real time. Based on this thickness, the theoretical offset of the tab spacing is determined, and the actual adjustment amount of the tab spacing is determined based on the current winding tension value, thus obtaining an accurate tab alignment spacing. This avoids the problem of incorrect tab cutting spacing and misalignment of tabs on the same side caused by changes in the thickness of the incoming material during the cell winding process, thereby improving the yield rate of wound cell products.

[0083] In one embodiment, such as Figure 3 As shown, step 205 above, which obtains the theoretical distance between the current electrode and the previous electrode, can also be achieved through the following steps:

[0084] Step 301: Obtain the reference thickness, the first target winding angle of the current electrode tab in the electrode material, and the second target winding angle of the previous electrode tab in the electrode material.

[0085] Step 302: Based on the reference thickness and the first target winding angle, obtain the first target position of the current electrode tab on the electrode material;

[0086] Step 303: Based on the reference thickness and the second target winding angle, obtain the second target position of the first electrode tab on the electrode material;

[0087] Step 304: Determine the theoretical distance based on the positions of the first and second targets.

[0088] In this case, the winding angle difference between adjacent same-side tabs aligned in the wound cell is 2π, therefore the first target winding angle is 2π larger than the second target winding angle.

[0089] For example, assuming the number of positive and negative tabs required for the current wound cell is n, then the winding angle corresponding to each negative tab is 0 + 2iπ (i = 0, 1, 2, ..., n), and the corresponding winding angle for the positive tab is π + 2iπ (i = 0, 1, 2, ..., n). The tabs in the finished wound cell are as follows: Figure 4 As shown. Based on the reference thickness and the target winding angle of each electrode, the theoretical target position of each electrode can be calculated using the following formula.

[0090]

[0091] L0 needs to be determined based on the actual scenario, specifically satisfying the condition that L should be 0 when θ = 0 and r0 is the core radius. According to the physical meaning of the formula, the above-mentioned reference thickness is divided by 2π and substituted into the parameter b in the formula (representing the increase in the winding radius for each unit increase in the winding helix angle). Simultaneously, the target winding angle difference of the tabs is substituted into the parameter θ. The calculated L is the theoretical target position of the corresponding tab on the incoming material. Finally, the theoretical spacing between each pair of adjacent tabs is obtained based on the theoretical target positions of adjacent tabs.

[0092] In this embodiment, the theoretical spacing of the electrodes is calculated based on the reference thickness of the electrode material and the winding angle of the electrodes, so as to make subsequent spacing adjustments and achieve the goal of aligning the electrodes on the same side.

[0093] In one embodiment, step 304 above, which determines the theoretical distance based on the first target position and the second target position, can also be achieved through the following steps:

[0094] Step 1: Obtain the width of the first electrode corresponding to the current electrode and the width of the second electrode of the previous electrode;

[0095] Step two: Determine the theoretical spacing based on the width of the first electrode, the width of the second electrode, the position of the first target, and the position of the second target.

[0096] In the same embodiment, step two above, which determines the theoretical spacing based on the width of the first electrode tab, the width of the second electrode tab, the first target position, and the second target position, can also be achieved through the following steps:

[0097] Step 1: Based on the width of the first electrode tab and the position of the first target, obtain the position of the front end of the current electrode tab;

[0098] Step 2: Based on the width of the second electrode and the position of the second target, obtain the position of the rear end of the first electrode.

[0099] Step 3: Determine the theoretical spacing based on the position of the front end and the rear end of the electrode tab.

[0100] For example, such as Figure 4 As shown, each tab has a different width, and the tab spacing calculation needs to take the tab width into account. Assume the width of each tab is W1, W2…W n The current first target position of the electrode is L. i The current position of the front end of the electrode is L. i -W i / 2; The second target position of the previous pole piece is L i-1 Then the rear end position of the first electrode is L.i-1 +W i-1 / 2. Subtract the rear end position of the previous electrode from the front end position of the current electrode. The difference is the theoretical spacing required for cutting between the current electrode and the previous electrode.

[0101] In this embodiment, the theoretical spacing between the electrodes is calculated based on the different electrode widths and target positions, so as to make subsequent spacing adjustments and achieve the goal of aligning electrodes on the same side.

[0102] In one embodiment, step 203 above, which obtains the corresponding theoretical winding tension value based on the current roll diameter, can also be achieved through the following steps:

[0103] Step 1: Obtain the winding diameter range, taper tension coefficient, and initial taper tension value of the electrode material.

[0104] Step 2: Determine the theoretical winding tension value for the electrode material based on the roll diameter range, taper tension coefficient, initial taper tension value, and current roll diameter.

[0105] The roll diameter range consists of the maximum roll diameter and the minimum roll diameter.

[0106] Furthermore, the maximum roll diameter is the target roll diameter that the battery cell needs to achieve when the electrode material is wound in actual operation; the minimum roll diameter is the radius of the core.

[0107] The winding tension coefficient can be preset by the user, and is generally set to 0.6 to 0.8.

[0108] For example, the user-preset target roll diameter and core radius are obtained, serving as the maximum and minimum roll diameters respectively, to form the roll diameter range for winding the electrode material into the battery cell. The user-preset winding tension coefficient is also obtained. Then, the formula T... i =T0*[1-k*(A / B)], A=r i -r min B = r max -r min The theoretical winding tension value corresponding to the current roll diameter is calculated, where T i T0 is the theoretical winding tension value at the current winding diameter, T0 is the initial winding tension value, k is the winding tension coefficient, and r is the winding tension coefficient. i r is the current volume diameter min For the minimum roll diameter, r max This is the maximum roll diameter.

[0109] In this embodiment, the theoretical winding tension value is calculated based on the initial winding tension value and the current winding diameter, and then compared with the current winding tension value to adjust the tab spacing and achieve the purpose of aligning the tabs on the same side.

[0110] In one embodiment, step 204 above, which obtains the spacing adjustment amount of the current electrode relative to the previous electrode based on the current winding tension value, the theoretical winding tension value, and the spacing offset, can also be achieved through the following steps:

[0111] Step 1: Obtain the ratio between the theoretical winding tension and the current winding tension;

[0112] Step 2: Obtain the product between the ratio and the spacing offset, which serves as the spacing adjustment amount of the current electrode relative to the previous electrode.

[0113] For example, when the thickness of the electrode material changes, causing a change in the roll diameter, it will not only directly affect the tab spacing but also the winding tension during winding. Therefore, it is necessary to consider both the actual current winding tension and the theoretical winding tension under ideal conditions. The tab spacing adjustment is calculated using the formula ΔL'=ΔL*(T / T'), where ΔL' is the spacing adjustment, ΔL is the spacing offset, T is the theoretical winding tension, and T' is the current winding tension.

[0114] In this embodiment, the changes in winding tension caused by the current thickness of the incoming electrode material are taken into account, thereby obtaining an accurate adjustment amount for the electrode tab spacing, achieving the goal of aligning the electrodes on the same side, and improving the product qualification rate.

[0115] In another embodiment, such as Figure 5 As shown, a method for aligning the same-side electrodes is provided, including the following steps:

[0116] Step 501: Obtain the current thickness of the electrode material to be wound.

[0117] Step 502: Based on the thickness difference between the current thickness and the reference thickness, obtain the spacing offset of the current tab relative to the previous tab.

[0118] Step 503: Obtain the current roll diameter, the roll diameter range of the electrode material being wound, the taper tension coefficient, and the initial taper tension value.

[0119] Step 504: Determine the theoretical winding tension value for the electrode material based on the roll diameter range, taper tension coefficient, initial taper tension value, and current roll diameter.

[0120] Step 505: Obtain the current winding tension value and the ratio between the theoretical winding tension and the current winding tension.

[0121] Step 506: Obtain the product between the ratio and the spacing offset, which is used as the spacing adjustment amount of the current electrode relative to the previous electrode.

[0122] Step 507: Obtain the reference thickness, the first target winding angle of the current tab in the electrode material, and the second target winding angle of the previous tab in the electrode material.

[0123] Step 508: Based on the reference thickness and the first target winding angle, obtain the first target position of the current electrode tab on the electrode material; and based on the reference thickness and the second target winding angle, obtain the second target position of the previous electrode tab on the electrode material.

[0124] Step 509: Obtain the width of the first electrode corresponding to the current electrode and the width of the second electrode of the previous electrode.

[0125] Step 510: Based on the width of the first electrode tab and the first target position, obtain the front end position of the current electrode tab; based on the width of the second electrode tab and the second target position, obtain the rear end position of the previous electrode tab.

[0126] Step 511: Determine the theoretical spacing based on the position of the front end and the rear end of the electrode tab.

[0127] Step 512: Determine the alignment spacing for tab alignment based on the theoretical spacing and the spacing adjustment amount.

[0128] For example, the above method can be applied to the winding battery process. The tab cutting control device executing the above method can be a laser cutting control device. The tab cutting control device obtains the current thickness of the incoming electrode material from a thickness measuring device via Controller Area Network (CANopen) communication. The thickness measuring device has a repeatability of ±0.3μm and is positioned after the unwinding roller and before laser cutting. The tab cutting control device also obtains the current tension value, core radius, and current roll diameter from the winding control device, which can be a programmable logic control system (PLC control system). Based on the reference thickness of the incoming electrode material, the width of each tab, and the winding angle of each tab (all preset by the user according to product requirements), the tab cutting control device obtains the theoretical tab alignment spacing between each pair of tabs. For example, the center position of each tab is calculated according to the following formula: the incoming arc length is calculated based on the winding angle θ = 0 + 2iπ (i = 0, 1, 2, ... n) and the reference thickness of each negative tab, and is taken as the center position L1, L2...L... of the negative tab. n The corresponding winding angle of each positive electrode tab is θ = (2i+1)π (i = 0, 1, 2, ... n).

[0129]

[0130] The tab width of each negative electrode tab is W1, W2…W n Then the corresponding position at the front end of each negative electrode tab is L. if =Li -W i / 2, the corresponding position in the backend is L ib =L i +W i / 2, subtracting the position of the rear end of the previous electrode from the position of the front end of the next electrode gives the theoretical electrode alignment spacing, i.e., p i =L (i+1)f -L ib Accordingly, the theoretical spacing k for positive electrode tab alignment is obtained. i Then, based on the fixed angle difference of 2π between the tabs obtained from the thickness difference of the current thickness, the spacing offset Δp is calculated. i and Δk i Then, through formula T i =T0*[1-k*(A / B)], A=r i -r min B = r max -r min The theoretical winding tension value corresponding to the current roll diameter is calculated, where T i T0 is the theoretical winding tension value at the current winding diameter, T0 is the initial winding tension value, k is the winding tension coefficient, and r is the winding tension coefficient. i r is the current volume diameter min For the minimum roll diameter (where r is the core roll diameter), max The maximum winding diameter (the diameter of the wound battery cell). The current winding tension value T is obtained from the winding control equipment. i ', calculate ψ = T i / T i Finally, calculate the spacing adjustment amount Δp. i '=ψ*Δp i and Δk i =ψ×Δk i Finally, based on the spacing adjustment amount and the theoretical spacing (p) i or k i The electrode tab alignment spacing on the incoming electrode material is calculated in this operation, and the electrode tab cutting control system completes the cutting of the electrode tab according to the electrode tab alignment spacing.

[0131] In this embodiment, the current thickness of the incoming electrode material is detected from the source. Then, during laser cutting before winding, the tab alignment spacing is adjusted using the method described above, thereby controlling the tab alignment and improving product yield and equipment efficiency. This solves the problem of winding alignment exceeding tolerance requirements due to thickness errors in the incoming electrode sheet and separator, and reduces waste of intermediate cell material and winding time caused by manual measurement and correction after winding.

[0132] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0133] Based on the same inventive concept, this application also provides a same-side tab alignment device for implementing the same-side tab alignment method described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more same-side tab alignment device embodiments provided below can be found in the limitations of the same-side tab alignment method above, and will not be repeated here.

[0134] In one embodiment, such as Figure 6 As shown, a same-side tab alignment device is provided, including: a thickness acquisition module 601, an offset acquisition module 602, a roll diameter processing module 603, an adjustment amount acquisition module 604, and an alignment spacing determination module 605, wherein:

[0135] Thickness acquisition module 601 is used to acquire the current thickness of the electrode material to be wound;

[0136] The offset acquisition module 602 is used to obtain the spacing offset of the current electrode relative to the previous electrode based on the thickness difference between the current thickness and the reference thickness.

[0137] The roll diameter processing module 603 is used to obtain the current roll diameter and, based on the current roll diameter, obtain the corresponding theoretical winding tension value.

[0138] The adjustment amount acquisition module 604 is used to acquire the current winding tension value and obtain the spacing adjustment amount of the current electrode relative to the previous electrode based on the current winding tension value, the theoretical winding tension value and the spacing offset.

[0139] The alignment spacing determination module 605 is used to obtain the theoretical spacing between the current electrode and the previous electrode, and determine the alignment spacing for electrode alignment based on the theoretical spacing and the spacing adjustment amount.

[0140] In one embodiment, the alignment spacing determination module 605 is further configured to: obtain a reference thickness, a first target winding angle of the current tab in the electrode material, and a second target winding angle of the previous tab in the electrode material; obtain a first target position of the current tab on the electrode material based on the reference thickness and the first target winding angle; obtain a second target position of the previous tab on the electrode material based on the reference thickness and the second target winding angle; and determine the theoretical spacing based on the first target position and the second target position.

[0141] In one embodiment, the alignment spacing determination module 605 is further configured to obtain the width of the first electrode corresponding to the current electrode and the width of the second electrode of the previous electrode; and determine the theoretical spacing based on the width of the first electrode, the width of the second electrode, the first target position, and the second target position.

[0142] In one embodiment, the alignment spacing determination module 605 is further configured to: obtain the front end position of the current electrode based on the width of the first electrode and the first target position; obtain the rear end position of the previous electrode based on the width of the second electrode and the second target position; and determine the theoretical spacing based on the front end position and the rear end position of the electrode.

[0143] In one embodiment, the adjustment amount acquisition module 604 is further configured to acquire the ratio between the theoretical winding tension and the current winding tension; and acquire the product between the ratio and the spacing offset as the spacing adjustment amount of the current tab relative to the previous tab.

[0144] In one embodiment, the above-mentioned roll diameter processing module 603 is further configured to obtain the roll diameter range, taper tension coefficient and initial taper tension value of the electrode material being wound; and determine the theoretical winding tension value for the electrode material based on the roll diameter range, taper tension coefficient, initial taper tension value and current roll diameter.

[0145] Each module in the aforementioned same-side tab alignment device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.

[0146] In one embodiment, a tab cutting control device is provided. This device may be a terminal, and its internal structure diagram may be as follows: Figure 7As shown, the device includes a processor, memory, input / output interfaces, and a communication interface. The processor, memory, and input / output interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the input / output interfaces. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interfaces are used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a same-side tab alignment method.

[0147] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the tab cutting control device to which the present application is applied. The specific tab cutting control device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0148] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0149] Obtain the current thickness of the electrode material to be wound;

[0150] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0151] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0152] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0153] Obtain the theoretical distance between the current electrode and the previous electrode, and determine the alignment distance for electrode alignment based on the theoretical distance and the distance adjustment amount.

[0154] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0155] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0156] Obtain the current thickness of the electrode material to be wound;

[0157] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0158] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0159] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0160] Obtain the theoretical distance between the current electrode and the previous electrode, and determine the alignment distance for electrode alignment based on the theoretical distance and the distance adjustment amount.

[0161] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0162] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0163] Obtain the current thickness of the electrode material to be wound;

[0164] Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current electrode relative to the previous electrode is obtained;

[0165] Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value;

[0166] Obtain the current winding tension value, and based on the current winding tension value, the theoretical winding tension value, and the spacing offset, obtain the spacing adjustment amount of the current electrode relative to the previous electrode.

[0167] Obtain the theoretical distance between the current electrode and the previous electrode, and determine the alignment distance for electrode alignment based on the theoretical distance and the distance adjustment amount.

[0168] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0169] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0170] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0171] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for aligning same-side electrodes, characterized in that, The method includes: Obtain the current thickness of the electrode material to be wound; Based on the thickness difference between the current thickness and the reference thickness, the spacing offset of the current tab relative to the previous tab is obtained; wherein, the calculation formula for the spacing offset is as follows: In the formula, L0 should satisfy the condition that L should be 0 when θ=0 and r0 is the core radius; b represents the value obtained by dividing the thickness difference by 2π; θ represents the winding angle difference between the tabs; L represents the spacing offset. Obtain the current roll diameter, and based on the current roll diameter, obtain the corresponding theoretical winding tension value; Obtain the current winding tension value, and obtain the ratio between the theoretical winding tension and the current winding tension; obtain the product between the ratio and the spacing offset, and use it as the spacing adjustment amount of the current electrode relative to the previous electrode; Obtain the theoretical distance between the current electrode tab and the previous electrode tab, and determine the alignment distance for electrode tab alignment based on the theoretical distance and the distance adjustment amount.

2. The method according to claim 1, characterized in that, The step of obtaining the theoretical distance between the current electrode and the previous electrode includes: Obtain the reference thickness, the first target winding angle of the current electrode tab in the electrode material, and the second target winding angle of the previous electrode tab in the electrode material; Based on the reference thickness and the first target winding angle, the first target position of the current electrode tab on the electrode material is obtained; Based on the reference thickness and the second target winding angle, the second target position of the first electrode tab on the electrode material is obtained; The theoretical distance is determined based on the first target position and the second target position.

3. The method according to claim 2, characterized in that, Determining the theoretical distance based on the first target position and the second target position includes: Obtain the width of the first electrode corresponding to the current electrode and the width of the second electrode of the previous electrode; The theoretical spacing is determined based on the width of the first electrode tab, the width of the second electrode tab, the first target position, and the second target position.

4. The method according to claim 3, characterized in that, Determining the theoretical spacing based on the width of the first electrode tab, the width of the second electrode tab, the first target position, and the second target position includes: The position of the front end of the current electrode is obtained based on the width of the first electrode and the first target position; The position of the rear end of the first electrode is obtained based on the width of the second electrode and the second target position; The theoretical spacing is determined based on the position of the front end of the current electrode and the position of the rear end of the previous electrode.

5. The method according to claim 1, characterized in that, The step of obtaining the corresponding theoretical winding tension value based on the current roll diameter includes: Obtain the winding diameter range, taper tension coefficient, and initial taper tension value of the electrode material; The theoretical winding tension value for the incoming electrode material is determined based on the roll diameter range, the taper tension coefficient, the initial taper tension value, and the current roll diameter.

6. A device for aligning tabs on the same side, characterized in that, The device includes: The thickness acquisition module is used to acquire the current thickness of the electrode material to be wound. The offset acquisition module is used to obtain the spacing offset of the current tab relative to the previous tab based on the thickness difference between the current thickness and the reference thickness; wherein, the calculation formula for the spacing offset is as follows: In the formula, L0 should satisfy the condition that L should be 0 when θ=0 and r0 is the core radius; b represents the value obtained by dividing the thickness difference by 2π; θ represents the winding angle difference between the tabs; L represents the spacing offset. The roll diameter processing module is used to obtain the current roll diameter and, based on the current roll diameter, obtain the corresponding theoretical winding tension value. The adjustment amount acquisition module is used to acquire the current winding tension value, acquire the ratio between the theoretical winding tension and the current winding tension, and acquire the product between the ratio and the spacing offset as the spacing adjustment amount of the current electrode relative to the previous electrode. The alignment spacing determination module is used to obtain the theoretical spacing between the current electrode and the previous electrode, and determine the alignment spacing for electrode alignment based on the theoretical spacing and the spacing adjustment amount.

7. The apparatus according to claim 6, characterized in that, The alignment spacing determination module is further configured to obtain the reference thickness, the first target winding angle of the current electrode tab in the electrode material, and the second target winding angle of the previous electrode tab in the electrode material; and to obtain the first target position of the current electrode tab on the electrode material based on the reference thickness and the first target winding angle. Based on the reference thickness and the second target winding angle, the second target position of the first tab on the electrode material is obtained; based on the first target position and the second target position, the theoretical spacing is determined.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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