Battery cell tab cutting method, device, equipment and medium

Abstract

The invention discloses a battery cell tab cutting method, device and equipment and a medium, and relates to the technical field of soft package battery modules, the method comprises the following steps: obtaining an initial stress borne by foam between an end plate and a battery cell; calculating the actual stress of each layer of foam based on the initial stress and the attenuation coefficient of the soft package battery module; calculating the actual compression amount of each layer of foam according to the actual stress of each layer of foam and the effective elastic modulus of the foam; calculating the theoretical compression amount of each layer of foam according to the design parameters of the soft package battery module; and determining the target cutting length of each battery cell tab according to the difference value between the actual compression amount and the theoretical compression amount of each layer of foam. According to the method, the difference value between the actual compression amount and the theoretical compression amount of each layer of foam is calculated to determine the target cutting length of each battery cell tab, so that the lengths of the tabs after cutting are consistent, and the tabs can be accurately matched with preformed holes of a busbar.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of soft package battery module, in particular to a method and device for cutting electrode tab of battery cell, equipment and medium. BACKGROUND

[0002] In recent years, new energy vehicles have developed rapidly, and three-electricity products have become the focus of major automakers. The most concerned is battery safety. Solid-state batteries have significant advantages in energy density and safety. Major battery manufacturers and automakers have increased research and development of solid-state batteries. Soft package battery cells are generally used in solid-state batteries. In order to further improve the energy density of solid-state batteries, more and more battery cells are integrated in a single soft package module. In order to achieve interference and impact, more than 5mm of foam is added between each battery cell. By compressing the foam, the entire module battery cell is compressed in the width direction. In order to improve the production rhythm, the soft package electrode tab is cut in advance. The cutting length of all battery cells is generally consistent. However, when a large number of battery cells are stacked and pre-tightened, and the foam is compressed, the busbar installation and the electrode tab passing through the busbar are generally a whole for a parallel battery cell block. However, the compression degree of the foam between each battery cell in a parallel block is inconsistent, resulting in a deviation of the electrode tab of each battery cell in a block relative to the busbar. When the number of battery cells in a single module is too large, different blocks will deviate relative to the busbar. Therefore, if the lengths of all electrode tabs of the battery cells are completely consistent, it will cause some electrode tabs to be too short or too long, increasing the risk of subsequent welding quality and the difficulty of the electrode tab bending process. SUMMARY

[0003] The present application provides a method and device for cutting electrode tab of battery cell, equipment and medium, which can solve the technical problem of the difference in the cutting length of the electrode tab of different battery cells in a soft package battery module.

[0004] In a first aspect, the present application provides a method for cutting electrode tab of battery cell, which is used in a soft package battery module. The soft package battery module includes an end plate, a battery cell and foam. The method for cutting electrode tab of battery cell includes the following steps: obtaining the initial stress of the foam between the end plate and the battery cell; calculating the actual stress of each layer of foam based on the initial stress and the attenuation coefficient of the soft package battery module; calculating the actual compression amount of each layer of foam according to the actual stress of each layer of foam and the effective elastic modulus of the foam; calculating the theoretical compression amount of each layer of foam according to the design parameters of the soft package battery module; determining the target cutting length of each electrode tab of the battery cell according to the difference between the actual compression amount and the theoretical compression amount of each layer of foam.

[0005] In combination with the first aspect, in an implementation, the initial stress borne by the foam located between the end plate and the battery cell is obtained, including: The initial stress borne by the foam located between the end plate and the battery cell is calculated, specifically calculated as:

[0006] Wherein, is the initial stress borne by the foam located between the end plate and the battery cell, is the static clamping force applied by the end plate on the entire battery cell and foam stack, is the cross-sectional area of the foam located between the end plate and the battery cell.

[0007] In combination with the first aspect, in an implementation, the actual stress of each layer of foam is calculated based on the initial stress and the attenuation coefficient of the soft-pack battery module, specifically calculated as:

[0008] Wherein, is the actual stress of the foam of the i-th layer, is the initial stress borne by the foam located between the end plate and the battery cell, is the attenuation coefficient of the soft-pack battery module, is a natural constant.

[0009] In combination with the first aspect, in an implementation, the actual compression amount of each layer of foam is calculated according to the actual stress of each layer of foam and the effective elastic modulus of the foam, including: Obtaining the material parameters of the foam, wherein the material parameters of the foam at least include the elastic modulus, Poisson's ratio and initial thickness of the foam; Calculating the effective elastic modulus of the foam according to the material parameters of the foam, specifically calculated as:

[0010] Wherein, is the effective elastic modulus of the foam, is the elastic modulus of the foam, is the Poisson's ratio of the foam; Calculating the actual compression amount of each layer of foam according to the actual stress of each layer of foam and the effective elastic modulus of the foam, specifically calculated as:

[0011] Wherein, is the actual compression amount of the foam of the i-th layer, is the initial thickness of the foam.

[0012] ​​In conjunction with the first aspect, in one embodiment, calculating the theoretical compression of each layer of foam based on the design parameters of the pouch battery module includes: Obtain the design parameters of the soft-pack battery module, which include at least the net space width between the two end plates, the number of battery cells, the thickness of the battery cells, and the number of foam layers. The theoretical compression of each layer of foam is calculated based on the design parameters of the pouch battery module, specifically:

[0013] in, This represents the theoretical compression capacity of the foam; the theoretical compression capacity is the same for each layer of foam. This refers to the net width of the space between the two end plates. For the thickness of the battery cell, The number of layers in the foam. This represents the number of battery cells.

[0014] In conjunction with the first aspect, in one embodiment, determining the target cutting length of each battery cell tab based on the difference between the actual compression and the theoretical compression of each layer of foam includes: Calculate the difference between the actual compression and the theoretical compression of each layer of foam, specifically as follows:

[0015] in, For the first The difference between the actual compression and the theoretical compression of the first layer of foam is the value of the second layer. The first battery cell was due to the first The positional offset caused by the compression deviation of the foam layers; Determine the sign of the difference; if the difference is positive, then determine the first... The target cutting length of each battery cell tab should be the length of the preset tab reference cutting length plus the difference. If the difference is negative, then the first... The target cutting length of each battery cell tab should be the length of the absolute value of the difference from the preset tab reference cutting length.

[0016] In conjunction with the first aspect, in one embodiment, the preset tab reference cutting length is the tab base length determined according to the installation position of the pouch battery module and the busbar.

[0017] Secondly, embodiments of this application provide a battery cell tab cutting device, the battery cell tab cutting device comprising: The acquisition module is used to acquire the initial stress on the foam located between the end plate and the battery cell; The first calculation module is used to calculate the actual stress of each layer of foam based on the initial stress and the attenuation coefficient of the soft-pack battery module. The second calculation module is used to calculate the actual compression of each layer of foam based on the actual stress of each layer of foam and the effective elastic modulus of the foam. The third calculation module is used to calculate the theoretical compression of each layer of foam based on the design parameters of the soft-pack battery module. The cutting module is used to calculate the difference between the actual compression amount and the theoretical compression amount of each layer of foam, and to determine the target cutting length of the battery electrode tab located on the left side of each layer of foam based on the difference.

[0018] Thirdly, this application provides a battery tab cutting device, which includes a processor, a memory, and a battery tab cutting program stored in the memory and executable by the processor. When the battery tab cutting program is executed by the processor, it implements the steps of the battery tab cutting method described in any of the above embodiments.

[0019] Fourthly, embodiments of this application provide a computer-readable storage medium storing a battery cell tab cutting program, wherein when the battery cell tab cutting program is executed by a processor, it implements the steps of the battery cell tab cutting method described in any of the above embodiments.

[0020] The beneficial effects of the technical solutions provided in this application include: This application embodiment determines the target cutting length of each cell tab by calculating the difference between the actual compression and theoretical compression of each layer of foam, ensuring that the tabs accurately match the pre-drilled holes in the busbar even after the module is pre-tightened during stacking. This application embodiment introduces the attenuation coefficient of the pouch battery module, providing a more realistic input value for the calculation, thereby improving the accuracy of the actual compression calculation of each layer of foam. This application embodiment pre-calculates the tab cutting length, avoiding the need for manual adjustment or rework due to tab deviations, thus improving overall manufacturing efficiency. Precise tab length control reduces mechanical stress concentration during bending or welding, lowering the risk of tab tearing or damage, thereby improving the long-term structural stability of the battery module under interference, impact, and other conditions. Attached Figure Description

[0021] Figure 1 A flowchart illustrating the method for cutting battery cell tabs provided in this application; Figure 2 This is a schematic diagram showing the distribution of the battery cells, foam, and end plates provided in this application; Figure 3 A partial structural schematic diagram of the soft-pack battery module provided in this application; Figure 4 A schematic diagram of the functional modules of the battery cell tab cutting device provided in this application; Figure 5 This is a schematic diagram of the hardware structure of the battery cell tab cutting device involved in the embodiments of this application.

[0022] 1. End plate; 2. Electrode tab; 3. Foam; 4. Battery cell; 5. Normal-sized bent electrode tab; 6. Shorter-sized bent electrode tab; 7. Busbar. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0025] This application provides a method, apparatus, device, and medium for cutting battery cell tabs, which can solve the technical problem in the prior art where the cutting length of different battery cell tabs differs within a single soft-pack battery module.

[0026] In a first aspect, embodiments of this application provide a method for cutting battery cell tabs.

[0027] In one embodiment, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating the method for cutting the battery cell tabs provided in this application. Figure 1 As shown, the method for cutting the battery cell tabs specifically includes the following steps: Step S1: Obtain the initial stress on the foam located between the end plate and the battery cell.

[0028] In this embodiment of the application, the specific method for obtaining the initial stress on the foam located between the end plate and the battery cell is as follows: Calculate the initial stress on the foam located between the end plate and the battery cell. The specific calculation is as follows:

[0029] in, This refers to the initial stress on the foam located between the end plate and the battery cell. The static clamping force applied by the end plate to the entire cell and foam stack is the static clamping force. This refers to the cross-sectional area of ​​the foam located between the end plate and the battery cell.

[0030] Figure 2 A schematic diagram showing the distribution of the battery cell 4, foam 3, and end plate 1 provided in this application. See also... Figure 2 The pouch battery module includes two end plates 1 and multiple battery cells 4 located between the end plates 1. Foam 3 is disposed between the end plates 1 and the battery cells 4, and foam 3 is also disposed between adjacent battery cells 4. The end plates 1 are external structural components of the pouch battery module, typically made of metal or plastic. The main function of the end plates 1 is to provide structural support, protect the battery cells 4, and ensure the correct positioning of the battery cells 4 within the module. Pre-tightening force is applied through the end plates 1 to ensure that the battery cells 4 and the foam 3 maintain tight contact during stacking, preventing loosening and vibration. The battery cells 4 are the core components of the pouch battery module, responsible for storing and releasing electrical energy. Figure 2 Multiple battery cells 4 are stacked side-by-side to form a battery module. In the pouch battery module, the battery cells 4 are isolated and buffered by foam 3 to ensure that the battery cells 4 can be evenly stressed and maintain structural stability during the stacking process. The tabs 2 are the positive and negative leads of the battery cells 4, used to connect to external circuits. The tabs 2 extend from the battery cells 4 and are electrically connected through busbar 7. The length of the tabs 2 needs to be precisely calculated to ensure accurate connection with busbar 7.

[0031] Specifically, the initial stress refers to the stress borne by the foam 3 located between the end plate 1 and the cell 4 after the module assembly is completed. This stress reflects the stress state of the foam 3 during the module pre-tightening process. The static clamping force is the total force applied by the end plate 1 to the stack of the cell 4 and the foam 3 during module assembly, thereby ensuring tight contact between the cell 4 and the foam 3 and preventing loosening during use. The static clamping force is usually determined by a combination of factors, including the expansion force of the cell 4, the mechanical strength requirements of the module, and safety regulations. The cross-sectional area of ​​the foam 3 refers to the cross-sectional area of ​​the foam 3 in the direction of force application. In soft-pack battery modules, the cross-sectional area of ​​the foam 3 is usually matched to the size of the cell 4. By accurately obtaining the initial stress, the actual deformation of the foam 3 in the module can be predicted more precisely, thereby optimizing the cutting length of the tab 2 and improving the overall performance of the module.

[0032] Step S2: Calculate the actual stress of each layer of foam 3 based on the initial stress and the attenuation coefficient of the soft-pack battery module.

[0033] In this embodiment, based on the initial stress and the attenuation coefficient of the pouch battery module, the specific calculation of the actual stress of each layer of foam 3 is as follows:

[0034] in, For the first The actual stress of the foam layer, This refers to the initial stress on the foam located between the end plate and the battery cell. The attenuation coefficient of the soft-pack battery module. It is a natural constant.

[0035] Specifically, the attenuation coefficient is a parameter reflecting the layer-by-layer attenuation of stress within the module. Since the stress distribution within the module is not perfectly uniform, the foam 3 near end plate 1 experiences higher stress, while the foam 3 further away from end plate 1 experiences lower stress. The attenuation coefficient quantifies this layer-by-layer stress attenuation, reflecting the non-uniformity of stress distribution within the module. By calculating the actual stress in each layer of foam 3, the stress distribution within the module can be analyzed more accurately. The attenuation coefficient typically depends on the properties of the foam 3 material, the surface roughness of the battery cell 4, the number of stacked layers of foam 3 and battery cell 4, and the magnitude of the static clamping force. In practical applications, the value of the attenuation coefficient can be determined through experiments or high-fidelity finite element simulations.

[0036] This application embodiment introduces an attenuation coefficient, which can effectively calculate the final cutting length of the electrode 2 based on the phenomenon that the electrode 2 of the cell near the end plate 1 is shorter and the electrode 2 of the middle cell is longer, thereby reducing the quality risk of subsequent welding and bending.

[0037] Step S3: Calculate the actual compression of each layer of foam 3 based on the actual stress of each layer of foam 3 and the effective elastic modulus of foam 3.

[0038] In this embodiment of the application, step S3 specifically includes the following steps: Step S31: Obtain the material parameters of foam 3, wherein the material parameters of foam 3 include at least the elastic modulus, Poisson's ratio, and initial thickness of foam 3.

[0039] Specifically, the elastic modulus of foam 3 represents the ability of foam 3 to resist deformation, the Poisson's ratio of foam 3 represents the ratio of the deformation in the vertical direction to the deformation in that direction when foam 3 is compressed in one direction, and the initial thickness represents the thickness of foam 3 in the uncompressed state.

[0040] Step S32: Calculate the effective elastic modulus of foam 3 based on the material parameters of foam 3. The specific calculation is as follows:

[0041] in, The effective elastic modulus of foam 3, The elastic modulus of foam 3 is given by [reference]. The Poisson's ratio for foam 3.

[0042] Specifically, in the soft-pack battery module, the foam 3 is tightly constrained between the cell 4 and the end plate 1. As a result, when the foam 3 is compressed in the thickness direction, its lateral expansion in the length and width directions is restricted. The elastic modulus of the foam 3 is corrected to calculate the effective elastic modulus of the foam 3, ensuring that the elastic modulus used to calculate the actual compression of each layer of foam 3 matches the actual constrained state of the foam 3 in the module.

[0043] Step S33: Based on the actual stress and effective elastic modulus of each layer of foam 3, calculate the actual compression of each layer of foam 3. The specific calculation is as follows:

[0044] in, For the first The actual compression of the foam layers. This represents the initial thickness of the foam.

[0045] Specifically, by employing an effective elastic modulus, the calculated compression amount is not the compression amount of foam 3 in its free state, but rather its actual compression amount under the confined environment of the module. Step S3 indicates that the final position of the cell 4 is affected not only by the non-uniformity of the internal stress distribution, but also by the stiffness change of foam 3 itself under confined conditions.

[0046] Step S4: Calculate the theoretical compression of each layer of foam 3 based on the design parameters of the soft-pack battery module.

[0047] In this embodiment of the application, step S4 specifically includes the following steps: Step S41: Obtain the design parameters of the soft-pack battery module, wherein the soft-pack battery module includes at least the net space width between the two end plates 1, the number of cells 4, the thickness of cells 4, and the number of layers of foam 3.

[0048] Specifically, the net space width between the two end plates 1 refers to the total space width between the inner sides of the two end plates 1 that can accommodate all the battery cells 4 and foam 3.

[0049] Step S42: Calculate the theoretical compression of each layer of foam 3 based on the design parameters of the soft-pack battery module, specifically:

[0050] in, This represents the theoretical compression capacity of the foam; the theoretical compression capacity is the same for each layer of foam. This refers to the net width of the space between the two end plates. For the thickness of the battery cell, The number of layers in the foam. This represents the number of battery cells.

[0051] Specifically, the theoretical compression amount refers to the amount by which foam 3 is compressed from its initial thickness to its designed thickness. The theoretical compression amount does not take into account frictional dissipation and stress attenuation during the force transmission process. It is based on uniform force and assumes that the compression amount and the thickness after compression of each layer of foam are exactly the same.

[0052] Step S5: Determine the target cutting length of each cell tab based on the difference between the actual compression amount and the theoretical compression amount of each layer of foam 3.

[0053] In this embodiment of the application, step S5 specifically includes the following steps: Step S51: Calculate the difference between the actual compression and the theoretical compression of each layer of foam 3. The specific calculation is as follows:

[0054] in, For the first The difference between the actual compression and the theoretical compression of layer 3 foam is the value of the first layer. The 4th cell is due to the The positional offset caused by the compression deviation of layer 3 foam; Specifically, suppose that a single module has a total of Because the outermost layer of foam 3 is end plate 1, which directly contacts foam 3, the number of battery cells (4) is one less than the number of foam 3. In a typical stack (endplate-foam-cell-foam-cell-...-foam-endplate), the first... The compression amount of layer 3 foam directly determines the third The final position of cell 4. When the actual compression is less than the theoretical compression, it means that the first... The third layer of foam was not fully compressed, and its thickness was greater than the design value, resulting in the third... Cell 4 failed to retract to its theoretical position, relative to the first... The final position of cell 4 is now further forward. When the actual compression is greater than the theoretical compression, it means that the fourth cell... The third layer of foam was excessively compressed, its thickness being smaller than the design value, causing the battery cell 4 in front of it to recede further than its theoretical position, relative to the first layer. The final position of cell 4 is now further forward. The sign of the offset defines the direction of the offset, and its absolute value defines the magnitude of the offset.

[0055] Step S52: Determine the sign of the difference. If the difference is positive, then determine the first... The target cutting length of each cell tab 2 should be the length of the difference added to the preset tab reference cutting length. If the difference is negative, then the first tab is determined to be... The target cutting length of each battery cell tab 2 should be the absolute value of the difference from the preset tab reference cutting length.

[0056] Specifically, if A positive value indicates that cell 4 is positioned too far forward. To allow tab 2 to still pass through the pre-drilled hole in busbar 7, tab 2 needs to be lengthened, with a compensation amount of [missing value]. The target length of electrode 2 is equal to the preset reference length plus... .like A negative value indicates that cell 4 is positioned too far back. To allow tab 2 to still pass through the pre-drilled hole in busbar 7, tab 2 needs to be shortened, with a compensation amount of [missing value]. The target length of electrode 2 is equal to the preset reference length plus... .

[0057] In this embodiment, the preset tab reference cutting length is the tab base length determined according to the installation position of the pouch battery module and the busbar 7.

[0058] Figure 3 This is a partial structural diagram of the soft-pack battery module provided in this application.

[0059] See Figure 3 , Figure 3 The battery cell 4 has both standard-sized bent tabs 5 and shorter bent tabs 6, with the shorter tabs 6 located closer to the end plate 1. A standard-sized bent tab 5 indicates that the foam compression of the cell 4 is close to the theoretical value, ensuring the tab length meets requirements and forms a good match with the busbar 7 after bending, providing ideal conditions for subsequent laser welding. A shorter bent tab 6 indicates that the foam compression of the cell 4 is greater than the theoretical value, resulting in excessive backward displacement of the cell 4 in the width direction. Since the tabs are cut to a uniform length, this excessive backward displacement directly causes the tabs to become too short relative to the busbar 7. In this embodiment, by ensuring that all tabs are of appropriate length and aligned before welding, defects such as incomplete welding, over-welding, and insufficient welding strength caused by inconsistent tab lengths are fundamentally eliminated, improving the conductivity reliability and mechanical stability of the soft-pack battery module.

[0060] This application embodiment determines the target cutting length of each cell tab by calculating the difference between the actual compression and theoretical compression of each layer of foam, ensuring that the tabs accurately match the pre-drilled holes in the busbar even after the module is pre-tightened during stacking. This application embodiment introduces the attenuation coefficient of the pouch battery module, providing a more realistic input value for the calculation, thereby improving the accuracy of the actual compression calculation of each layer of foam. This application embodiment pre-calculates the tab cutting length, avoiding the need for manual adjustment or rework due to tab deviations, thus improving overall manufacturing efficiency. Precise tab length control reduces mechanical stress concentration during bending or welding, lowering the risk of tab tearing or damage, thereby improving the long-term structural stability of the battery module under interference, impact, and other conditions.

[0061] Secondly, embodiments of this application also provide a battery cell tab cutting device.

[0062] In one embodiment, reference is made to Figure 4 , Figure 4 This is a functional module diagram of the battery cell tab cutting device provided in this application. Figure 4 As shown, the battery cell tab cutting device includes: The acquisition module is used to acquire the initial stress on the foam located between the end plate and the battery cell; The first calculation module is used to calculate the actual stress of each layer of foam based on the initial stress and the attenuation coefficient of the soft-pack battery module. The second calculation module is used to calculate the actual compression of each layer of foam based on the actual stress of each layer of foam and the effective elastic modulus of the foam. The third calculation module is used to calculate the theoretical compression of each layer of foam based on the design parameters of the soft-pack battery module. The cutting module is used to calculate the difference between the actual compression and the theoretical compression of each layer of foam, and to determine the target cutting length of the battery cell tab located on the left side of each layer of foam based on the difference.

[0063] The functions of each module in the above-mentioned battery cell tab cutting device correspond to the steps in the above-mentioned battery cell tab cutting method embodiment, and their functions and implementation processes will not be described in detail here.

[0064] Thirdly, this application provides a battery tab cutting device, which includes a processor, a memory, and a battery tab cutting program stored in the memory and executable by the processor. When the battery tab cutting program is executed by the processor, it implements the steps of the battery tab cutting method in any of the above embodiments.

[0065] Thirdly, embodiments of this application provide a battery cell tab cutting device, which can be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.

[0066] Reference Figure 5 , Figure 5 This is a schematic diagram of the hardware structure of the battery cell tab cutting device involved in the embodiments of this application. In the embodiments of this application, the battery cell tab cutting device may include a processor, a memory, a communication interface, and a communication bus.

[0067] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0068] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting devices within the battery cell tab cutting equipment, as well as interfaces used for interconnecting the battery cell tab cutting equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0069] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0070] The processor can be a general-purpose processor, which can call the battery tab cutting program stored in the memory and execute the battery tab cutting method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the battery tab cutting program is called can be referred to the various embodiments of the battery tab cutting method of this application, and will not be repeated here.

[0071] Those skilled in the art will understand that Figure 5 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0072] Fourthly, embodiments of this application provide a computer-readable storage medium storing a battery cell tab cutting program, wherein when the battery cell tab cutting program is executed by a processor, it implements the steps of the battery cell tab cutting method described in any of the above embodiments.

[0073] The present application has a computer-readable storage medium storing a battery tab cutting program, wherein when the battery tab cutting program is executed by a processor, the steps of the battery tab cutting method described above are implemented.

[0074] The method implemented when the battery cell tab cutting procedure is executed can be referred to in various embodiments of the battery cell tab cutting method of this application, and will not be repeated here.

[0075] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0076] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0077] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0078] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0079] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0080] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0081] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for cutting battery cell tabs, used in a pouch battery module, the pouch battery module comprising an end plate, a battery cell, and foam, characterized in that, The method for cutting the battery cell tabs includes: Obtain the initial stress on the foam located between the end plate and the battery cell; Based on the initial stress and the attenuation coefficient of the soft-pack battery module, the actual stress of each layer of foam is calculated; Calculate the actual compression of each foam layer based on the actual stress and effective elastic modulus of each foam layer. The theoretical compression of each layer of foam is calculated based on the design parameters of the soft-pack battery module. The target cutting length of each cell tab is determined based on the difference between the actual compression and the theoretical compression of each layer of foam.

2. The method for cutting battery cell tabs according to claim 1, characterized in that, The method of obtaining the initial stress on the foam located between the end plate and the battery cell includes: Calculate the initial stress on the foam located between the end plate and the battery cell. The specific calculation is as follows: in, This refers to the initial stress on the foam located between the end plate and the battery cell. The static clamping force applied by the end plate to the entire cell and foam stack is the static clamping force. This refers to the cross-sectional area of ​​the foam located between the end plate and the battery cell.

3. The method for cutting battery cell tabs according to claim 2, characterized in that, Based on the initial stress and the attenuation coefficient of the pouch battery module, the actual stress of each layer of foam is calculated, specifically as follows: in, For the first The actual stress of the foam layer, This refers to the initial stress on the foam located between the end plate and the battery cell. The attenuation coefficient of the soft-pack battery module. It is a natural constant.

4. The method for cutting battery cell tabs according to claim 3, characterized in that, Based on the actual stress and effective elastic modulus of each foam layer, calculate the actual compression of each foam layer, including: Obtain the material parameters of the foam, which include at least the elastic modulus, Poisson's ratio, and initial thickness of the foam; The effective elastic modulus of the foam is calculated based on its material parameters. The specific calculation is as follows: in, The effective elastic modulus of foam, This refers to the elastic modulus of the foam. The Poisson's ratio of the foam; Based on the actual stress and effective elastic modulus of each foam layer, the actual compression of each foam layer is calculated as follows: in, For the first The actual compression of the foam layer. This represents the initial thickness of the foam.

5. The method for cutting battery cell tabs according to claim 4, characterized in that, The calculation of the theoretical compression of each layer of foam based on the design parameters of the soft-pack battery module includes: Obtain the design parameters of the soft-pack battery module, which include at least the net space width between the two end plates, the number of battery cells, the thickness of the battery cells, and the number of foam layers. The theoretical compression of each layer of foam is calculated based on the design parameters of the pouch battery module, specifically: in, This represents the theoretical compression capacity of the foam; the theoretical compression capacity is the same for each layer of foam. This refers to the net width of the space between the two end plates. For the thickness of the battery cell, The number of layers in the foam. This represents the number of battery cells.

6. The method for cutting battery cell tabs according to claim 5, characterized in that, The determination of the target cutting length of each battery cell tab based on the difference between the actual compression and theoretical compression of each layer of foam includes: Calculate the difference between the actual compression and the theoretical compression of each layer of foam, specifically as follows: in, For the first The difference between the actual compression and the theoretical compression of the first layer of foam is the value of the second layer. The first battery cell was due to the first The positional offset caused by the compression deviation of the foam layers; Determine the sign of the difference; if the difference is positive, then determine the first... The target cutting length of each battery cell tab should be the length of the preset tab reference cutting length plus the difference. If the difference is negative, then the first... The target cutting length of each cell tab should be the length of the absolute value of the difference from the preset tab reference cutting length.

7. The method for cutting battery cell tabs according to claim 6, characterized in that, The preset tab reference cutting length is the tab base length determined according to the installation position of the soft-pack battery module and the busbar.

8. A battery cell tab cutting device, characterized in that, The battery cell tab cutting device includes: The acquisition module is used to acquire the initial stress on the foam located between the end plate and the battery cell; The first calculation module is used to calculate the actual stress of each layer of foam based on the initial stress and the attenuation coefficient of the soft-pack battery module. The second calculation module is used to calculate the actual compression of each layer of foam based on the actual stress of each layer of foam and the effective elastic modulus of the foam. The third calculation module is used to calculate the theoretical compression of each layer of foam based on the design parameters of the soft-pack battery module. The cutting module is used to calculate the difference between the actual compression amount and the theoretical compression amount of each layer of foam, and to determine the target cutting length of the battery electrode tab located on the left side of each layer of foam based on the difference.

9. A battery cell tab cutting device, characterized in that, The battery tab cutting device includes a processor, a memory, and a battery tab cutting program stored in the memory and executable by the processor, wherein when the battery tab cutting program is executed by the processor, it implements the steps of the battery tab cutting 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 battery tab cutting program, wherein when the battery tab cutting program is executed by a processor, it implements the steps of the battery tab cutting method as described in any one of claims 1 to 7.

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