A method, device and electronic device for calculating the length of a strapping belt

Abstract

The embodiment of the present application provides a method, device and electronic device for calculating the length of a strapping tape, which relates to the field of fuel cell technology, and is used to calculate the length of the strapping tape so that the length of the overlapping portion of the strapping tape remains consistent after the battery stack is strapped. The method includes: determining the width of the battery stack and the rounded corner difference of the strapping tape according to the model of the battery stack; the rounded corner difference of the strapping tape is determined according to the rounded corner formed when the strapping tape is strapped to the battery stack; measuring the actual height of the battery stack; calculating the total length of the strapping tape according to the width, the actual height, the rounded corner difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a method and device for calculating the length of a strapping belt, and an electronic device. Background Art

[0002] A fuel cell stack is also called an electric pile, which is usually made up of multiple single cells stacked and bundled together. A single cell is composed of a bipolar plate, a membrane electrode assembly, and a sealing component. In order to combine multiple single cells into an electric pile, multiple fuel cell cells can be bundled together using a bundling tape.

[0003] At present, the strapping straps of each model of battery stack have a fixed length, but the height of the battery stack itself has a tolerance, which usually leads to large differences in the length of the overlapping parts of the strapping straps after different battery stacks are bundled. In addition, if the overlapping part is too long, it will interfere with other parts during the assembly of the battery stack into a module. If the overlapping part is too short, it will lead to poor welding of the weld, resulting in insufficient tensile strength and affecting product quality. Summary of the invention

[0004] The embodiments of the present application provide a method, device and electronic device for calculating the length of a strapping strap, which are used to calculate the length of the strapping strap so that the length of the overlapping portion of the strapping strap remains consistent after the battery stack is bundled.

[0005] In a first aspect, an embodiment of the present application provides a method for calculating the length of a strapping tape, comprising: determining the width of the battery stack and the corner fillet difference of the strapping tape according to the model of the battery stack; the corner fillet difference of the strapping tape is determined according to the corner fillet formed when the strapping tape is used to strap the battery stack; measuring the actual height of the battery stack; calculating the total length of the strapping tape according to the width, the actual height, the corner fillet difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset.

[0006] Based on the above scheme, the system can calculate the total length of the strapping tape according to the width, actual height, fillet difference and overlapping length of the battery stack. Since the length of the strapping tape is calculated based on the actual height of the battery stack, the length of the overlapping part after the battery stack is bundled with the strapping tape of this length can be kept consistent, thereby improving the consistency and aesthetics of the product. This can avoid the problem of interference with other components caused by the length of the overlapping part being too long, and can also avoid the problem of insufficient tensile strength caused by the length of the overlapping part being too short, thereby ensuring the quality of the battery stack.

[0007] In a possible implementation, the calculating the total length of the strapping strap according to the width, the actual height, the fillet difference and the overlap length specifically includes: calculating the total length of the strapping strap according to the following formula:

[0008] L=h real *2+w*2-R+a

[0009] Wherein, L is the total length of the strapping belt, h real is the actual height, w is the width, R is the rounded corner difference, and a is the overlapping length.

[0010] Based on the above scheme, the total length of the strapping tape can be calculated by the above formula. And after bundling the battery stack with a strapping tape whose length is the total length, the overlapping length after bundling can be kept consistent, thereby improving the consistency and aesthetics of the product. In addition, it can also avoid the problem of interference with other components caused by the length of the overlapping part being too long, and the problem of insufficient tensile strength caused by the length of the overlapping part being too short.

[0011] In one possible implementation, the battery stack is bundled with a strapping tape having a length equal to the total length; the actual length of the overlapping portion of the strapping tape is measured; if the actual length is within a first preset range, it is determined that the battery stack is bundled properly; if the actual length is not within the first preset range, it is determined that the battery stack is bundled unqualified; wherein the first preset range is determined based on the overlapping length.

[0012] Based on the above scheme, after the battery stack is bundled, the actual length of the overlapping part of the bundling belt is measured, and it is determined whether the actual length is within the first preset range, so as to determine whether the battery stack bundling is qualified. Then, the battery stack with unqualified overlapping part length can be re-bundled, so as to achieve the consistency of the overlapping part length of the battery stack shipped from the factory, and improve the consistency and aesthetics of the product.

[0013] In one possible implementation, a first height corresponding to a first pressure value is determined based on a correspondence between a pre-stored pressure value and a height of a battery stack; the first pressure value is the magnitude of a packaging force of the battery stack; a second height of the battery stack corresponding to an upper limit value of a second preset range is determined based on a correspondence between the pre-stored pressure value and the height of the battery stack; the upper limit value of the second preset range is the sum of the first pressure value and a preset maximum error; the upper limit value of the first preset range is calculated based on a difference between the second height and the first height and the overlap length.

[0014] Based on the above scheme, the maximum allowable length of the overlapping part of the strapping belt, which is the upper limit of the first preset range, can be determined by the correspondence between the pre-stored pressure value and the height of the battery stack, and the upper limit value within the specified second preset range. Therefore, it can be determined whether the overlapping part of the strapping belt is too long according to the upper limit value of the first preset range, avoiding the problem of interference with other components caused by the excessive length of the overlapping part.

[0015] In one possible implementation, the third height of the battery stack corresponding to the lower limit value of the second preset range is determined based on the correspondence between the pre-stored pressure value and the height of the battery stack; the lower limit value of the second preset range is the difference between the first pressure value and the preset maximum error; the lower limit value of the first preset range is calculated based on the difference between the third height and the first height and the overlap length.

[0016] Based on the above scheme, the minimum allowable length of the overlapping part of the strapping tape, i.e., the lower limit value of the first preset range, can be determined by the correspondence between the pre-stored pressure value and the height of the battery stack, and the lower limit value within the specified second preset range. Therefore, it can be determined whether the overlapping part of the strapping tape is too short according to the lower limit value of the first preset range, thereby avoiding the problem of insufficient tensile strength caused by the short length of the overlapping part.

[0017] In one possible implementation, the battery stack is bundled with a strapping tape having a length equal to the total length; the actual length of the overlapping portion of the strapping tape is measured; and based on the correspondence between a pre-stored pressure value and the actual length of the overlapping portion of the strapping tape, the pressure value corresponding to the actual length is determined as the actual packaging force of the battery stack after bundling.

[0018] Based on the above scheme, the packaging force of the battery stack after bundling can be determined by the length of the overlapping part after bundling, without the need to use sensors or strain gauges for measurement. By determining the packaging force after bundling the battery stack, the problem of the battery stack performance being unqualified due to excessive packaging force can be avoided, and the problem of shortened battery stack life and hydrogen leakage due to insufficient packaging force can also be avoided.

[0019] In a second aspect, an embodiment of the present application provides a device for calculating the length of a strapping tape, comprising: a processing unit, for determining the width of the battery stack and the corner fillet difference of the strapping tape according to the model of the battery stack; the corner fillet difference of the strapping tape is determined based on the corner fillet formed when the strapping tape is used to strap the battery stack; measuring the actual height of the battery stack; calculating the total length of the strapping tape according to the width, the actual height, the corner fillet difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset.

[0020] In a possible implementation, when the processing unit calculates the total length of the strapping tape according to the width, the actual height, the fillet difference and the overlap length, the processing unit is specifically configured to calculate the total length of the strapping tape according to the following formula:

[0021] L=h real *2+w*2-R+a

[0022] Wherein, L is the total length of the strapping belt, hreal is the actual height, w is the width, R is the rounded corner difference, and a is the overlapping length.

[0023] In a possible implementation, the processing unit is further used to: bundle the battery stack with a strapping strap having a length equal to the total length; measure the actual length of the overlapping portion of the strapping strap; if the actual length is within a first preset range, determine that the battery stack is bundled properly; if the actual length is not within the first preset range, determine that the battery stack is bundled unqualified; wherein the first preset range is determined based on the overlapping length.

[0024] In a possible implementation, the processing unit is also used to: determine a first height corresponding to a first pressure value based on a correspondence between pre-stored pressure values ​​and the height of the battery stack; the first pressure value is the magnitude of the packaging force of the battery stack; determine a second height of the battery stack corresponding to an upper limit value of a second preset range based on the correspondence between the pre-stored pressure values ​​and the height of the battery stack; the upper limit value of the second preset range is the sum of the first pressure value and a preset maximum error; and calculate the upper limit value of the first preset range based on the difference between the second height and the first height and the overlap length.

[0025] In one possible implementation, the processing unit is also used to: determine the third height of the battery stack corresponding to the lower limit value of the second preset range based on the correspondence between the pre-stored pressure value and the height of the battery stack; the lower limit value of the second preset range is the difference between the first pressure value and the maximum error; calculate the lower limit value of the first preset range based on the difference between the third height and the first height and the overlap length.

[0026] In one possible implementation, the processing unit is further used to: bundle the battery stack with a strapping tape having a length equal to the total length; measure the actual length of the overlapping portion of the strapping tape; and determine, based on a correspondence between a pre-stored pressure value and the actual length of the overlapping portion of the strapping tape, that the pressure value corresponding to the actual length is the actual packaging force of the battery stack after bundling.

[0027] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0028] Memory, for storing computer instructions;

[0029] A processor is connected to the memory, and is used to execute computer instructions in the memory, and implement the method as described in any one of the first aspects when executing the computer instructions.

[0030] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including:

[0031] The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is enabled to perform the method as described in any one of the first aspects.

[0032] For each aspect from the second to the fourth aspect and the technical effects that may be achieved by each aspect, please refer to the above description of the technical effects that can be achieved by the first aspect or various possible schemes in the first aspect, and no further details will be given here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0034] Figure 1 A schematic diagram of the structure of a system for applying the method for calculating the length of a strapping belt provided in an embodiment of the present application;

[0035] Figure 2 One of the exemplary flow charts of a method for calculating the length of a strapping belt provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of battery stack bundling provided in an embodiment of the present application;

[0037] Figure 4 One of the exemplary flow charts of a method for calculating the length of a strapping belt provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of a strapping length calculation device provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the technical solutions provided by the embodiments of the present application, the professional terms involved in the embodiments of the present application are introduced below.

[0041] (1) A fuel cell stack is a combination of two or more cells and plates, current collectors, end plates, seals, strapping tapes and other structural components with a uniform electrical output.

[0042] (2) Packaging force: the force applied by the strapping tape to tighten the battery stack after the battery stack is bundled.

[0043] (3) Pressing force: the force applied by the pressing equipment to the fuel cell stack during press-fitting.

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the technical solution of the present application, rather than all of the embodiments. Based on the embodiments recorded in the application documents, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the technical solution of the present application.

[0045] The terms "first" and "second" in the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any of their variations are intended to cover non-exclusive protection. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices. "Multiple" in the present application can mean at least two, for example, two, three or more, and the embodiments of the present application are not limited.

[0046] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0047] At present, the strapping straps of each model of battery stack have a fixed length, but there is a tolerance in the height of the battery stack itself, which usually leads to large differences in the length of the overlapping part of the strapping straps after different battery stacks are bundled. In addition, if the overlapping part is too long, it will interfere with other parts during the assembly of the battery stack into a module. If the overlapping part is too short, it will cause poor welding of the weld, resulting in insufficient tensile strength and affecting product quality. Therefore, how to calculate the length of the strapping strap so that the length of the overlapping part of the strapping strap remains consistent after the battery stack is bundled needs to be solved urgently.

[0048] In view of this, the present application provides a method for calculating the length of a strapping tape, which includes: determining the width of the battery stack and the fillet difference according to the model of the battery stack, and then determining the total length of the strapping tape required for strapping the battery stack according to the fillet difference, the width of the battery stack, the measured actual height of the battery stack during press-fitting, and the preset length of the overlapping portion of the strapping tape. The battery stack is strapped with the strapping tape of the total length, so that the length of the overlapping portion of the strapping tape after bundling can be kept consistent, thereby improving the consistency and aesthetics of the battery stack.

[0049] See also Figure 1A schematic diagram of the structure of a system for applying the method for calculating the length of a strapping tape provided in an embodiment of the present application. Figure 1 The system 100 shown may include a memory 110, a processor 120 and a communication interface 130. Among them, the memory 110 can be used to store the corresponding relationship between the pressure value and the height of the battery stack and the corresponding relationship between the pressure value and the actual length of the overlapping part of the strapping tape. The processor 120 is the control center of the system 100, and uses various interfaces and lines to connect various parts of the entire system 100. By running or executing software programs or modules stored in the memory 110, and calling data stored in the memory 110, it executes various functions of the system 100 and processes data. The communication interface 130 can be used to obtain the model of the battery stack and the preset overlapping length. Optionally, the processor 120 may include one or more processing units. The memory 110 may be a high-speed random access memory, or a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. It should be noted that the above Figure 1 The structure shown is only an example and is not limited to this embodiment of the present application.

[0050] See also Figure 2 One of the exemplary flow charts of a method for calculating the length of a strapping belt provided in an embodiment of the present application, the method can be applied to Figure 1 The system shown may include the following processes:

[0051] S201, the system determines the width of the battery stack and the corner radius difference of the strapping tape according to the model of the battery stack.

[0052] The system can be Figure 1 The communication interface 130 shown in the figure obtains the model of the battery stack. Since the width of the battery stack of the same model and the rounded corner difference of the strapping belt are the same, the system can Figure 1 The processor 120 shown determines the width of the battery stack and the corner radius difference of the strapping tape corresponding to the model of the battery stack.

[0053] The difference in rounded corners of the strapping tape is determined based on the rounded corners formed when the strapping tape is used to strap the battery stack. Figure 3 This is a schematic diagram of the battery stack bundling provided in the embodiment of the present application. Figure 3 As shown, assuming that the fillet radius is r, the actual height of the battery stack is h real , the width of the battery stack is w, and the overlapping length is a. The strapping tape is used to strap the battery stack in a clockwise direction from point A to point B. The portion between point A and point B is the overlapping portion of the strapping tape, and the length of the overlapping portion is the overlapping length. The rounded corner difference is the difference between the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rectangular shape and the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rounded shape. The rounded corner difference satisfies formula (1).

[0054] R=8r-2πr Formula (1)

[0055] Where R is the fillet difference and r is the fillet radius.

[0056] S202, the system measures the actual height of the battery stack.

[0057] The system can measure the actual height of the battery stack according to the tooling displacement of the pressing equipment when the battery stack is pressed at the second pressure value, wherein the second pressure value is the magnitude of the pressing force corresponding to the model of the battery stack.

[0058] S203, the system calculates the total length of the strapping tape according to the width, the actual height, the fillet difference and the overlapping length of the strapping tape.

[0059] The overlap length is preset. The preset overlap length can be determined by Figure 1 The communication interface 130 shown is obtained.

[0060] In a possible implementation, the system may calculate the total length of the strapping tape according to formula (2).

[0061] L=h real *2+w*2-R+a Formula (2)

[0062] Where L is the total length of the strapping tape, h real is the actual height of the battery stack, w is the width of the battery stack, R is the fillet difference, and a is the overlap length.

[0063] Based on the above scheme, the system can calculate the total length of the strapping tape according to the width of the battery stack, the actual height of the battery stack, the fillet difference of the strapping tape and the overlapping length. Since the length of the strapping tape is calculated based on the actual height of the battery stack when it is strapped, and the fillet difference, the length of the overlapping part after the battery stack is strapped with the strapping tape of this length can be kept consistent, thereby improving user satisfaction. It can also avoid the problem of interference with other components caused by the length of the overlapping part being too long, and the problem of insufficient tensile strength caused by the length of the overlapping part being too short.

[0064] In some examples, the system can also measure the actual length of the overlapping portion of the strapping tape after bundling the battery stack with a strapping tape having a length equal to the total length. When the actual length of the overlapping portion is within a first preset range, it is determined that the battery stack is bundled properly and can be shipped. When the actual length of the overlapping portion is not within the preset range, it is determined that the battery stack is bundled unqualified, and it is necessary to readjust the length of the strapping tape and re-bundle the battery stack. The first preset range is determined based on a preset overlapping length.

[0065] For example, assuming that the first preset range is 50±2.5mm, the lower limit of the first preset range is 47.5mm, and the upper limit of the first preset range is 52.5mm. If the actual length of the overlapping part is 51mm, since 51mm is greater than 47.5mm and less than 52.5mm, that is, the actual length of the overlapping part is less than the upper limit of the first preset range and greater than the lower limit of the first preset range, within the first preset range, it is determined that the battery stack is bundled and qualified and can be shipped. If the actual length of the overlapping part is 45mm, since 45mm is less than 47.5mm, that is, the actual length of the overlapping part is less than the minimum allowable length of the overlapping part, it is not within the first preset range. It can be determined that the bundling of the battery stack is unqualified and the bundling length needs to be readjusted to re-bundle the battery stack.

[0066] In a possible implementation, the upper limit value of the first preset range can be calculated according to the following method: the first height corresponding to the first pressure value can be determined according to the correspondence between the pre-stored pressure value and the height of the battery stack. Among them, the first pressure value is the size of the packaging force of the battery stack. Since in the actual production process of the battery stack, the packaging force is allowed to have errors, that is, the first pressure value is allowed to have errors, the second preset range can be determined according to the preset maximum error and the first pressure value. The upper limit value of the second preset range is the sum of the first pressure value and the maximum error. The lower limit value of the second preset range is the difference between the first pressure value and the maximum error. For example, the prescribed packaging force can be 20KN, the error can be 2%, then the error allowable range of the first pressure value is 20±0.4KN, of which 0.4KN is the maximum error, the upper limit value of the second preset range is 20.4KN, and the lower limit value of the second preset range is 19.6KN.

[0067] After the second preset range is determined, the first preset range can be determined based on the correspondence between the pre-stored pressure value and the height of the battery stack. Because the greater the pressure, the shorter the height of the battery stack and the longer the length of the overlapping part, the upper limit value of the first preset range can be calculated based on the upper limit value of the second preset range. Among them, the upper limit value of the second preset range is equal to the sum of the first pressure value and the maximum error. According to the correspondence between the pre-stored pressure value and the height of the battery stack, the second height of the battery stack corresponding to the upper limit value of the second preset range can be determined, and the upper limit value of the first preset range is calculated based on the difference between the second height and the first height and the overlapping length. The upper limit value of the first preset range satisfies formula (3).

[0068] c max =2Δh1+a Formula (3)

[0069] In the formula, c max is the upper limit of the first preset range, Δh1 is the difference between the second height and the first height, and a is the overlapping length.

[0070] For example, the second preset range can be 20±0.5KN, then the maximum error is 0.5KN, and the upper limit of the second preset range is 20.5KN. Assuming that according to the correspondence between the pre-stored pressure value and the height of the battery stack, it can be determined that the second height corresponding to the upper limit of the second preset range is 597.5mm, and the first height is 600mm, then the difference between the second height and the first height is 2.5mm. If the preset overlap length is 50mm, then according to formula (3), it can be determined that the upper limit of the first preset range is 55mm.

[0071] Based on the above scheme, the maximum allowable length of the overlapping part of the strapping belt, which is the upper limit of the first preset range, can be determined by the correspondence between the pre-stored pressure value and the height of the battery stack, and the upper limit value within the specified second preset range. Therefore, it can be determined whether the overlapping part of the strapping belt is too long according to the upper limit value of the first preset range, avoiding the problem of interference with other components caused by the excessive length of the overlapping part.

[0072] In another possible implementation, the lower limit of the first preset range may be calculated according to the following method: since the lower the pressure, the higher the height of the battery stack and the shorter the length of the overlapping portion, the lower limit of the first preset range may be calculated according to the lower limit of the second preset range. The lower limit of the second preset range is the difference between the first pressure value and the maximum error. According to the correspondence between the pre-stored pressure value and the height of the battery stack, the height of the battery stack corresponding to the lower limit of the second preset range can be determined, which can be represented by a third height. The lower limit of the first preset range can be determined according to the difference between the third height and the first height and the preset overlapping length, and the lower limit of the first preset range satisfies formula (4).

[0073] c min =a-2Δh2 Formula (4)

[0074] In the formula, c min is the lower limit of the first preset range, and Δh2 is the difference between the third height and the first height.

[0075] For example, the second preset range can be 20±0.5KN, then the maximum error is 0.5KN, and the lower limit of the first preset range is 19.5KN. Assuming that according to the correspondence between the pre-stored pressure value and the height of the battery stack, it can be determined that the third height corresponding to the lower limit of the first preset range is 603.5mm, and the first height is 600mm, then the difference between the third height and the first height is 3.5mm. If the preset overlap length is 50mm, then according to formula (4), the lower limit of the first preset range can be determined to be 43mm.

[0076] Based on the above scheme, the minimum allowable length of the overlapping part of the strapping tape, i.e., the lower limit value of the first preset range, can be determined by the correspondence between the pre-stored pressure value and the height of the battery stack, and the lower limit value within the specified second preset range. Therefore, it can be determined whether the overlapping part of the strapping tape is too short according to the lower limit value of the first preset range, thereby avoiding the problem of insufficient tensile strength caused by the short length of the overlapping part.

[0077] In a possible implementation, the corresponding relationship between the pressure value and the height of the battery stack can be obtained by performing a press-fit test on multiple battery stacks of the same model. Among them, the press-fit test can be to measure the height of the battery stack at different pressure values ​​by applying different pressures on the press-fit equipment to multiple battery stacks of the same model that have not been press-fitted. Then the heights of the same pressure value measured by multiple battery stacks can be averaged to determine the height of the battery stack corresponding to each pressure value, and the corresponding relationship between the pressure value and the height of the battery stack is stored in the memory. For example, a pressure of 20KN can be applied to three unpress-fitted battery stacks of the same model on three press-fitting devices at the same time, and the heights of the three battery stacks at this time are measured and the average value of the heights is taken as the height of the battery stack corresponding to the pressure of 20KN. Then a pressure of 25KN is applied to the three battery stacks at the same time, and the heights of the three battery stacks are measured and the average value of the heights is taken as the height of the battery stack corresponding to the pressure of 25KN. By analogy, the heights of the battery stacks corresponding to multiple different pressure values ​​can be obtained, thereby obtaining the corresponding relationship between the pressure value and the height of the battery stack. Optionally, after multiple press-fitting tests, a curve showing the corresponding relationship between the pressure value and the height of the battery stack can be drawn or a functional relationship between the pressure and the height of the battery stack can be determined, and the curve showing the corresponding relationship or the functional relationship can be stored in a memory. It should be understood that the number of battery stacks to be bundled simultaneously in the press-fitting test can be set according to actual conditions and experience, and this application does not limit this.

[0078] In another possible implementation, when performing a press-fit test, after applying different pressures to multiple unpress-fitted battery stacks of the same model on the press-fit equipment, the height difference of the battery stack can be measured according to the change in pressure value to obtain the relationship between the pressure difference and the height difference of the battery stack. For example, a pressure of 20KN can be applied to three unpress-fitted battery stacks of the same model on three press-fit equipment at the same time, and the average value of the height of the three battery stacks at this time is recorded, assuming that the average value is 700mm. Then a pressure of 25KN is applied to the three battery stacks at the same time. Assuming that the average value of the difference between the height of the three battery stacks at this time and the height of the battery stack at 20KN is 5mm, it can be determined that when the pressure difference is 5kN, the height difference of the battery stack is 5mm, and the corresponding relationship between the pressure difference and the height difference of the battery stack is stored in the memory. Optionally, after multiple press-fit tests, a curve of the corresponding relationship between the pressure difference and the height difference of the battery stack can be drawn or a functional relationship between the pressure difference and the height difference of the battery stack can be determined, and the curve or functional relationship of the corresponding relationship can be stored in the memory.

[0079] In one example, after bundling with a bundling tape having a length equal to the total length, the actual length of the overlapping portion of the bundling tape after bundling the battery stack can be measured. Then, the actual packaging force of the battery stack after bundling corresponding to the actual length of the overlapping portion of the bundling tape is determined based on the corresponding relationship between the pressure value and the actual length of the overlapping portion of the bundling tape. Optionally, when the actual packaging force is less than the lower limit value of the second preset range or greater than the upper limit value of the second preset range, it can be determined that the bundling of the battery stack is unqualified and the battery stack needs to be re-bundled. When the actual pressing force is within the second preset range, it is determined that the bundling of the battery stack is qualified and can be shipped.

[0080] In a possible implementation, during the press test, the corresponding relationship between the pressure value and the actual length of the overlapping part of the strapping tape can also be determined by the corresponding relationship between the pressure difference and the height difference of the battery stack. Specifically, the difference between the actual length of the overlapping part of the strapping tape and the preset overlapping length can be used as the height difference of the battery stack, and the pressure difference corresponding to the difference between the actual length of the overlapping part and the preset overlapping length can be determined by the corresponding relationship between the pressure difference and the height difference of the battery stack, and then the pressure value corresponding to the actual length of the overlapping part can be determined according to the first pressure value and the preset overlapping length. For example, assuming that the preset overlapping length is 50mm, the first pressure value is 20KN. The actual length of the overlapping part is 55mm. Then the difference between the actual length of the overlapping part and the preset overlapping length is 5mm. If the pressure difference is 5KN when the height difference is 5mm according to the corresponding relationship between the pressure difference and the height difference of the battery stack, then the pressure difference can be determined to be 5KN. Then the pressure difference corresponding to the difference between the actual length of the overlapping part and the preset overlapping length can be determined to be 5KN. Since the actual length of the overlapping part is greater than the preset actual length, it can be determined that the pressure value corresponding to the actual length of the overlapping part is 55mm is 25KN.

[0081] In another example, after the battery stack is bundled with a strapping tape, the height of the battery stack will also change because the packaging force applied by the strapping tape to the battery stack is usually smaller than the pressing force applied by the pressing equipment to the battery stack. Therefore, the actual packaging force of the battery stack can also be determined based on the difference between the height of the battery stack corresponding to the second pressure value and the actual height of the battery stack after bundling. For example, assuming that the second pressure value is 25KN, the height of the battery stack corresponding to the second pressure value is 600mm, and the actual height of the battery stack after bundling is 605mm, then the difference between the height of the battery stack corresponding to the second pressure value and the actual height of the battery stack after bundling is 5mm. If the corresponding relationship between the pressure difference obtained from the above-mentioned press-fitting test and the height difference of the battery stack can be determined to be 5KN for a pressure difference corresponding to 5mm, then it can be determined that the actual packaging force of the battery stack after bundling is 20KN.

[0082] Based on the above scheme, the packaging force of the battery stack after bundling can be detected, which can avoid the problem of unqualified performance of the battery stack due to excessive packaging force of the battery stack, and can also avoid the problem of shortened battery stack life and hydrogen leakage due to insufficient packaging force of the battery stack.

[0083] Below, in order to more clearly understand the solution proposed in the embodiment of the present application, a method for calculating the length of a strapping belt provided in the present application will be introduced in combination with a specific embodiment.

[0084] See also Figure 4 , which is one of the exemplary flow charts of a method for calculating the length of a strapping belt provided in an embodiment of the present application, can be applied to Figure 1 The system shown may include the following processes:

[0085] S401, determining the corresponding relationship between the pressure value and the height of the fuel cell stack through a press test.

[0086] The corresponding relationship between the pressure value and the height of the battery stack is determined by the press test and the corresponding relationship is pre-stored in the system. The press test method can be found in Figure 2 The relevant description in the method embodiment shown will not be repeated here.

[0087] S402, determining the width of the battery stack and the difference in the fillet of the strapping tape.

[0088] The system can determine the width of the battery stack and the corner radius difference of the strapping tape corresponding to the model of the battery stack according to the model of the battery stack.

[0089] S403, measuring the actual height of the battery stack.

[0090] The system can measure the actual height of the battery stack according to the tooling displacement of the pressing equipment when the battery stack is pressed at the second pressure value.

[0091] S404, calculating the total length of the strapping tape.

[0092] The method for calculating the total length of the strapping tape can be found in Figure 2 The relevant description in the method embodiment shown will not be repeated here.

[0093] S405: Determine a first preset range.

[0094] The system can determine the upper limit of the first preset range according to the sum of the first pressure value and the preset maximum error, and determine the lower limit of the first preset range according to the difference between the first pressure value and the preset maximum error. Figure 2 The relevant description in the method embodiment shown will not be repeated here.

[0095] S406, measuring the actual length of the overlapping portion.

[0096] After the battery stack is strapped with a strapping tape with a length equal to the total length, the actual length of the overlapping part can be measured.

[0097] S407, judging whether the battery stack bundling is qualified.

[0098] When the system determines that the actual length of the overlapping portion is within the first preset range, the battery stack bundling is determined to be qualified, and S408 is executed. When the system determines that the actual length of the overlapping portion is not within the first preset range, the battery stack bundling is determined to be unqualified, and S409 is executed.

[0099] S408, factory-issued.

[0100] When the system determines in S407 that the battery stack is bundled as qualified, the battery stack can be shipped.

[0101] S409, re-bundle.

[0102] When the system determines in S407 that the battery stack bundling is unqualified, the battery stack needs to be bundled again.

[0103] In one example, when the actual length of the overlapping part is less than the lower limit of the first preset range, the length of the strapping tape can be increased according to the difference between the actual length of the overlapping part and the minimum allowable length of the overlapping part to determine the length of the strapping tape. The battery stack is re-bundled with the strapping tape of this length, and the above steps of judging whether the strapping is qualified are repeated after bundling until the actual length of the overlapping part of the battery stack is within the first preset range. For example, assuming that when bundling the battery stack 1, the total length of the strapping tape is 1700mm, the lower limit of the first preset range is 47.5mm, and the upper limit of the first preset range is 52.5mm. If the actual length of the overlapping part is 45mm, the length of the strapping tape can be determined to be 1702.5mm according to the difference of 2.5mm between the actual length of the overlapping part and the lower limit of the first preset range, and the battery stack 1 is re-bundled with the strapping tape of 1702.5mm in length. After bundling, the above steps of judging whether the strapping is qualified are repeated until the actual length of the overlapping part of the battery stack is within the first preset range.

[0104] In another example, when the actual length of the overlapping part is greater than the upper limit of the first preset range, the length of the strapping tape can be reduced according to the difference between the actual length of the overlapping part and the upper limit of the first preset range to determine the length of the strapping tape. The battery stack is re-bundled with a strapping tape of this length, and the above steps of judging whether the strapping is qualified are repeated after bundling until the length of the overlapping part of the battery stack is within the first preset range. For example, assuming that when bundling the battery stack 2, the total length of the strapping tape is 1700mm, the lower limit of the first preset range is 47.5mm, and the upper limit of the first preset range is 52.5mm. If the actual length of the overlapping part is 60mm, the length of the strapping tape can be determined to be 1692.5mm according to the difference of 7.5mm between the actual length of the overlapping part and the upper limit of the first preset range, and the battery stack 2 is re-bundled with a strapping tape of 1692.5mm in length. After bundling, the above steps of judging whether the strapping is qualified are repeated until the actual length of the overlapping part of the battery stack is within the first preset range.

[0105] The same conception of the method, see Figure 5 , is a strapping length calculation device 500 provided in an embodiment of the present application. The device 500 can perform each step in the above method. To avoid repetition, it is not described in detail here. The device 500 includes an acquisition unit 501 and a processing unit 502. In one scenario:

[0106] The processing unit 502 determines the width of the battery stack and the corner fillet difference of the strapping tape according to the model of the battery stack; the corner fillet difference of the strapping tape is determined according to the corner fillet formed when the strapping tape is used to strap the battery stack; measures the actual height of the battery stack; calculates the total length of the strapping tape according to the width, the actual height, the corner fillet difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset.

[0107] In a possible implementation, when the processing unit 502 calculates the total length of the strapping tape according to the width, the actual height, the fillet difference and the overlap length, the processing unit 502 is specifically configured to calculate the total length of the strapping tape according to the following formula:

[0108] L=h real *2+w*2-R+a

[0109] Wherein, L is the total length of the strapping belt, h real is the actual height, w is the width, R is the rounded corner difference, and a is the overlapping length.

[0110] In a possible implementation, the processing unit 502 is further used to: bundle the battery stack with a strapping tape having a length equal to the total length; measure the actual length of the overlapping portion of the strapping tape; if the actual length is within a first preset range, determine that the battery stack is bundled properly; if the actual length is not within the first preset range, determine that the battery stack is bundled unqualified; wherein the first preset range is determined based on the overlapping length.

[0111] In a possible implementation, the processing unit 502 is also used to: determine a first height corresponding to a first pressure value based on a correspondence between a pre-stored pressure value and a height of the battery stack; the first pressure value is the magnitude of a packaging force of the battery stack; determine a second height of the battery stack corresponding to an upper limit value of a second preset range based on a correspondence between the pre-stored pressure value and the height of the battery stack; the upper limit value of the second preset range is the sum of the first pressure value and a preset maximum error; and calculate the upper limit value of the first preset range based on the difference between the second height and the first height and the overlap length.

[0112] In a possible implementation, the processing unit 502 is also used to: determine the third height of the battery stack corresponding to the lower limit value of the second preset range according to the correspondence between the pre-stored pressure value and the height of the battery stack; the lower limit value of the second preset range is the difference between the first pressure value and the maximum error; calculate the lower limit value of the first preset range according to the difference between the third height and the first height and the overlapping length.

[0113] In a possible implementation, the processing unit 502 is further used to: bundle the battery stack with a strapping tape having a length equal to the total length; measure the actual length of the overlapping portion of the strapping tape; and determine, based on a correspondence between a pre-stored pressure value and the actual length of the overlapping portion of the strapping tape, that the pressure value corresponding to the actual length is the actual packaging force of the battery stack after bundling.

[0114] Based on the same concept of the above method, see Figure 6 , an electronic device is provided for an embodiment of the present application, the electronic device includes a processor 601 and a memory 602. The memory 602 is used to store computer instructions, and the processor 601 is connected to the memory 602, and is used to execute the computer instructions in the memory 602, and implement the steps of any of the above methods when executing the computer instructions.

[0115] The embodiment of the present application further provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed on a computer, the computer executes the steps of any of the above methods.

[0116] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0117] Although the specific embodiments of the present application are described above, it should be understood by those skilled in the art that these are merely examples, and the scope of protection of the present application is limited by the attached claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the scope of protection of the present application. Although the preferred embodiments of the present application have been described, once those skilled in the art are aware of the basic creative concepts, additional changes and modifications may be made to these embodiments. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0118] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for calculating the length of a strapping belt, characterized in that: include: Determine the width of the battery stack and the rounded corner difference of the strapping tape according to the model of the battery stack; The difference in rounded corners of the strapping tape is the difference between the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rectangular shape and the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rounded shape; Measuring the actual height of the battery stack; Calculate the total length of the strapping tape according to the width, the actual height, the fillet difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset; The step of calculating the total length of the strapping belt according to the width, the actual height, the fillet difference and the overlap length specifically includes: The total length of the strapping tape is calculated according to the following formula: L=h real *2+w*2-R+a Wherein, L is the total length of the strapping belt, h real is the actual height, w is the width, R is the rounded corner difference, and a is the overlapping length.

2. The method according to claim 1, characterized in that: Also includes: Bundling the battery stack by using a bundling belt having a length equal to the total length; measuring the actual length of the overlapping portion of the strapping tape; If the actual length is within a first preset range, it is determined that the battery stack bundling is qualified; If the actual length is not within the first preset range, determining that the battery stack bundling is unqualified; Wherein, the first preset range is determined according to the overlapping length.

3. The method according to claim 2, characterized in that Also includes: Determining a first height corresponding to a first pressure value according to a pre-stored correspondence between a pressure value and a height of a battery stack; The first pressure value is the size of the packaging force of the battery stack; Determining a second height of the battery stack corresponding to an upper limit value of a second preset range according to the correspondence between the pre-stored pressure value and the height of the battery stack; The upper limit value of the second preset range is the sum of the first pressure value and a preset maximum error; An upper limit value of the first preset range is calculated according to a difference between the second height and the first height and the overlapping length.

4. The method according to claim 3, characterized in that Also includes: Determining, according to the correspondence between the pre-stored pressure value and the height of the battery stack, a third height of the battery stack corresponding to the lower limit value of the second preset range; The lower limit value of the second preset range is the difference between the first pressure value and the maximum error; The lower limit value of the first preset range is calculated according to the difference between the third height and the first height and the overlapping length.

5. The method according to any one of claims 1 to 4, characterized in that: Also includes: Bundling the battery stack by using a bundling belt having a length equal to the total length; Measuring the actual length of the overlapping portion of the strapping tape; According to the correspondence between the pre-stored pressure value and the actual length of the overlapping portion of the strapping belt, the pressure value corresponding to the actual length is determined as the actual packaging force of the battery stack after strapping.

6. A strapping length calculation device, characterized in that: include: A processing unit, used to determine the width of the battery stack and the fillet difference of the strapping belt according to the model of the battery stack; The rounded corner difference of the strapping tape is the difference between the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rectangular shape and the total length of the strapping tape required when the strapping tape is used to strap the battery stack in a rounded shape; the actual height of the battery stack is measured; the total length of the strapping tape is calculated according to the width, the actual height, the rounded corner difference and the overlapping length of the strapping tape; the overlapping length is the length of the overlapping portion of the strapping tape after the battery stack is strapped with the strapping tape, and the overlapping length is preset; Wherein, when the processing unit calculates the total length of the strapping belt according to the width, the actual height, the fillet difference and the overlapping length, it is specifically used to: The total length of the strapping tape is calculated according to the following formula: L=h real *2+w*2-R+a Wherein, L is the total length of the strapping belt, h real is the actual height, w is the width, R is the rounded corner difference, and a is the overlapping length.

7. The device according to claim 6, characterized in that The processing unit is also used for: Bundling the battery stack by using a bundling belt having a length equal to the total length; measuring the actual length of the overlapping portion of the strapping tape; If the actual length is within a first preset range, it is determined that the battery stack bundling is qualified; If the actual length is not within the first preset range, determining that the battery stack bundling is unqualified; Wherein, the first preset range is determined according to the overlapping length.

8. The device according to claim 7, characterized in that The processing unit is also used for: Determine a first height corresponding to a first pressure value according to a pre-stored correspondence between a pressure value and a height of a battery stack; the first pressure value is a magnitude of a packaging force of the battery stack; Determining a second height of the battery stack corresponding to an upper limit value of a second preset range according to the correspondence between the pre-stored pressure value and the height of the battery stack; The upper limit value of the second preset range is the sum of the first pressure value and a preset maximum error; An upper limit value of the first preset range is calculated according to a difference between the second height and the first height and the overlapping length.

9. The device according to claim 8, characterized in that The processing unit is also used for: According to the correspondence between the pre-stored pressure value and the height of the battery stack, a third height of the battery stack corresponding to the lower limit value of the second preset range is determined; the lower limit value of the second preset range is the difference between the first pressure value and the maximum error; The lower limit value of the first preset range is calculated according to the difference between the third height and the first height and the overlapping length.

10. The device according to any one of claims 6 to 9, characterized in that: The processing unit is also used for: Bundling the battery stack by using a bundling belt having a length equal to the total length; Measuring the actual length of the overlapping portion of the strapping tape; According to the correspondence between the pre-stored pressure value and the actual length of the overlapping portion of the strapping belt, the pressure value corresponding to the actual length is determined as the actual packaging force of the battery stack after strapping.

11. An electronic device, characterized in that: include: Memory, for storing computer instructions; A processor is connected to the memory, and is used to execute computer instructions in the memory, and implement the method according to any one of claims 1 to 5 when executing the computer instructions.

12. A computer-readable storage medium, characterized in that: include: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 5.

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